Watching Our Water Ways

Environmental reporter Christopher Dunagan discusses the challenges of protecting Puget Sound and all things water-related.
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Killer whales expected to head south any day now

Wednesday, October 1st, 2014

As chum salmon swim back to their home streams in Puget Sound this fall, three killer whale pods — the Southern Residents — can be expected to follow, making their way south along the eastern shoreline of the Kitsap Peninsula.

Whale viewing locations by Orca Network. Click on image to view Google map.

Whale viewing locations by Orca Network. Click on image to view Google map.

These forays into Central and South Puget Sound could begin any day now and continue until the chum runs decline in November or December. The Southern Residents, which typically hang out in the San Juan Islands in summer, have not been spotted for several days, so they are likely somewhere in the ocean at the moment, according to Howard Garrett of Orca Network.

This year, Orca Network has created a map of good viewing sites to help people look for whales from shore. As the orcas move south into Puget Sound, Orca Network’s Facebook page becomes abuzz with killer whale sightings. Observers can use the information to search for the whales from shore.

From my experience, it takes a bit of luck to find the orcas, because they are constantly moving. But the search can be fun if you consider it an adventure and don’t get too disappointed if you don’t find the whales right away.

Howie said expanding the network to include more land-based observers can help researchers track whale movements and occasionally go out to pick up samples of their fecal material or food left over from their foraging, helpful in expanding our knowledge about what they are eating.

Whale reports may be called in to Orca Network’s toll-free number: (866)-ORCANET, emailed to info@orcanetwork.org, or posted on Facebook, www.facebook.com/OrcaNetwork.

The new Viewpoints Map shows locations where killer whales have been sighted in the past, or else they lie along a known route of their travels.

I told Howie about a few good viewing locations in Kitsap County, based on my experiences, and he said he would welcome ideas from others as well.

“It’s a work in progress,” Howie said. “They just need to be locations that are public and accessible.” If you know of a good whale-watching spot, you can contact Howie or his wife Susan Berta by email, info@orcanetwork.org.

If offering a location for the map, please give a clear description of the site and state whether you have seen whales from that location or just believe it would work based on the view of the water.

Some people have expressed concern that real-time reports of whale movements may encourage boaters to go out and follow the orcas in Puget Sound, disturbing their feeding behavior at a critical time of year. But Howie says Orca Network has increased its reporting through the years and has not heard of many problems.

“It seems like a potential problem that never really happens,” he said.

Winter weather and rougher seas makes it difficult to find the whales from the water, Howie noted. As in summer, boaters are required by federal regulation to avoid interfering with their travels. See the “Be Whale Wise” website.

When reporting whale sightings to Orca Network, observers are asked to list the species, location, time, direction of travel and approximate number of animals. When reporting killer whales, the number of adult males with towering dorsal fins should be noted. Also report any behaviors, such as breaching, spy-hopping or feeding. Good photographs are especially valuable.

Sighting reports can be found on the Orca Network website, Facebook page or Twitter feed. One can also sign up for email alerts from the website, which includes reports of recent sightings as well as archives going back to 2001. The site also tracks news and research developments.

As Howard stated in a news release:

“We are very fortunate to live in a place where we can look out from nearby shorelines and see those majestic black fins parting the waters. We are thankful for the hundreds of citizens who report sightings each year, providing valuable data to help in recovery efforts for the endangered Southern Resident orcas.”

Orcas Dyes


Celebrating freedom for the Elwha River

Monday, September 1st, 2014

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Elwha Prigge

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I want to recognize the Kitsap Sun’s editorial cartoonist Milt Priggee for capturing the feeling of the moment last week when the final piece of a dam on the Elwha River was blown up. See Water Ways, Aug. 27, 2014.

The video below was recorded on that same day by Anne Shaffer of the Coastal Watershed Institute while snorkeling in a kelp bed in western Freshwater Bay, not far from where the Elwha River flows into the Strait of Juan de Fuca.

Watching this video and the large number of herring gives me a feeling of optimism, although I recognize there is no scientific basis for this. Someone please tell me the herring are doing better.

“We couldn’t think of a better place to be the day the last dam went down,” Anne said in an email to members of her listserv.

The Coastal Watershed Institute has been monitoring the nearshore area, where the Elwha River has been dramatically transforming the delta. Sediment, unleashed by dam removal, pours out of the Elwha and builds up in the estuary.

Tom Roorda, an aerial photographer, has been documenting the transformation with thousands of pictures he has taken over the past several years.

Tom Roorda of Roorda Aerial photography captured this image showing the ongoing buildup of sediment at the mouth of the Elwha River. Photo by Tom Roorda

Tom Roorda of Roorda Aerial photography captured this image showing the ongoing buildup of sediment at the mouth of the Elwha River. // Photo by Tom Roorda


Amusing Monday: Crack appears in Mexican desert

Monday, September 1st, 2014

For this week, let’s call it “Amazing Monday.” When I first saw this video, I thought it was a fake animation for a science fiction film. But it turns out that it could be the answer to a troubling riddle: What is dryer than a desert?

The crack might also be the result of erosion from either an underground or surface channel following an unusually heavy rain. Despite the attention in Mexican and U.S. news outlets, I have been unable to find a good explanation.

The crack is said to be about three-fourths mile long and up to 25 feet deep. Some nice close-in photos were posted on the website of Excelsior, a daily newspaper based in Mexico City. They show people standing next to the giant fissure. (When watching the video, it’s worth blowing it up to full screen.)

In a Washington Post story last week, reporter Joshua Partlow quoted a geologist at the University of Sonora as saying the crack was probably caused by pumping groundwater for irrigation:

“The chair of the geology department at the University of Sonora, in the northern Mexican state where this ‘topographic accident’ emerged, said that the fissure was likely caused by sucking out groundwater for irrigation to the point the surface collapsed.

“‘This is no cause for alarm,’ Inocente Guadalupe Espinoza Maldonado said. ‘These are normal manifestations of the destabilization of the ground.’”

I think the geologist’s comments were meant to quell fear and speculation that started running wild when the crack first opened. While it may not be cause for alarm, I can’t believe that a crack this size — which has cut off more than one roadway — can be considered a good thing. Nevertheless, it is fascinating, and I’d like to learn more about it.


Amusing Monday: Baby turtles race for the sea

Monday, July 28th, 2014

The sand was smooth and still. Waves lapped at the distant shoreline. A sign, stuck in the sand, stated, “Do not disturb. Sea turtle nest.”

That was the scene on a beach in the Florida Keys for the past few weeks, as it was in June, when I posted a blog entry listing cameras that were capturing live action in bird nests as well as other wildlife locations. A quiet patch of sand was not much to look at, so I didn’t mention it.

On Friday, that patch of sand came to life, as you can see in the first video on this page. I thought it was time to share the brief action, as about 100 loggerhead turtles emerged from the sand and headed out to sea about 9 p.m. Check out the action in full-screen.

The camera on the beach uses infrared lights to capture the images, thus avoiding visible light that could confuse the young turtles. The project is supported by Save-A-Turtle, a volunteer non-profit group dedicated to the protection of rare and endangered sea turtles and their habitats in the Florida Keys.

Meanwhile, some of the young ospreys shown in their nests back in June have fledged, but there is still plenty of action in the nest at Missoula’s Riverside Health Care Center, where the camera is operated by the University of Montana. Check out the images in full-screen, high-definition while you can, because these growing chicks will soon be gone.

Another still-active osprey nest is operated by Chesapeake Conservancy on Maryland’s eastern shoreline.

The Puffin Cam at Seal Island National Wildlife Refuge in Maine is picking up some excited feeding activity at the nesting area, where experts are establishing a new colony of puffins after hunters wiped them out in the 1800s.

Brown bears are now feeding on salmon along Alaska’s Brooks River in Katmai National Park, according to bloggers on the site. Check out the live video below to see if you can spot a bear, including a subadult mentioned by observers.

You may wish to go back to the June 23 “Amusing Monday: A visit with wildlife via webcam” to see what other cameras are picking up activity. You can generally count on Pete’s Pond on Mashatu Game Reserve in Botswana, Africa, for some exotic animals coming to the watering hole.



Broadcast live streaming video on Ustream


Stormwater: Can we stop the menace we created?

Tuesday, July 22nd, 2014

I’ve completed the seventh story package in a 10-part series examining the Puget Sound ecosystem, with a special focus on indicators of ecological health. We’re calling the project “Taking the Pulse of Puget Sound.”

Jenifer McIntyre of the Washington Stormwater Center studies the effects of stormwater after it passes through filters made of compost and soil materials, such as what is used in rain gardens. The filters are working, even though the most dangerous pollutants remain unidentified. Photo by Meegan M. Reid

Jenifer McIntyre of the Washington Stormwater Center studies the effects of stormwater after it passes through filters made of compost and soil materials, such as what is used in rain gardens. The filters are working, even though the most dangerous pollutants remain unidentified. / Kitsap Sun photo by Meegan M. Reid

The latest stories, which ran Sunday and Monday, addressed freshwater quality. The opening piece looked at the huge amounts of pollution coming into our streams via stormwater — one of the highest priorities for cleanup, yet one of the most difficult to deal with.

As the Puget Sound Partnership’s executive director Sheida Sahandy told me, industrial discharges are still a concern, but they are no longer the biggest problem.

“Now we’re dealing with stormwater, which is trickling in here and trickling in there, and everybody has a finger in it,” she said.

Solutions are many, and the goal should be to shut off pollution at the source, beginning with removing dangerous chemicals from everyday products. Since the sources of pollution are numerous, everyone needs to play a part — from cleaning up pet wastes to properly using of household chemicals to reducing the use of lawn and garden pesticides. (Those who don’t subscribe to the Kitsap Sun may still find value in the graphics on the Freshwater Quality page.)

I led off the first story by showing the increased efforts by city and county governments to better manage their stormwater systems, such as pumping out their catch basins, sweeping their streets and converting outdated stormwater ponds into filtration systems, commonly known as “rain gardens.”

I also introduced readers to the Washington Stormwater Center, a research facility in Puyallup where scientists are testing the effectiveness of rain gardens and pervious pavement. Jenifer McIntyre, a Washington State University researcher, has demonstrated that stormwater from highway runoff is 100 percent effective at killing adult coho salmon. Yet that same stormwater filtered through soil — such as in a rain garden — is cleaned up enough that fish can survive, apparently unaffected.

Monday’s story addressed the increasing use of benthic invertebrates — water bugs — to measure the health of streams. The bugs are doing double duty, since they are both a measurement of stream quality and a critical part of the food web for the freshwater ecosystem.

Some 27 local governments and organizations are involved in collecting data on benthic invertebrates from about 850 stream locations throughout Puget Sound. For results, check out Puget Sound Stream Benthos.

When I began this project on freshwater quality several weeks ago, I thought it was going to be easier than some of the other story packages I have done, such as on fish, birds and marine mammals. If anything, this issue is more complex. I’ll admit that I’ve neglected this blog while pursuing these issues, and soon I will be moving into the issue of freshwater quantity.

Overall, I must say that I’ve been impressed by the many people dedicated to finding answers to the mysterious problems brought on by pollution and by those finding solutions even before the questions are fully identified.


Amusing Monday: Celebrating Alvin’s animals

Monday, July 7th, 2014

This year is the 50th anniversary of Alvin, a deep-sea vehicle that has made some incredible scientific discoveries over the past half-century.

The latest issue of Oceanus magazine is a special edition that takes us through the history of Alvin, including its part in locating a lost hydrogen bomb, investigating the Deepwater Horizon oil spill and documenting the remains of the Titanic.

Read “The Once & Future Alvin,” Oceanus Summer 2014.

What really drew my attention to this issue is a photo feature called “Alvin’s Animals.” It was posted as a slide show in the online version of Oceanus. It registered high on my amusing meter, and I encourage you to click through the buttons that take you from one odd-looking creature to the next.

One of Alvin’s most significant discoveries came in 1977, when the submersible traveled to the Galapagos Rift, a deep-water area where volcanic activity had been detected. Scientists had speculated that steaming underwater vents were releasing chemicals into the ocean water. They got to see that, but what they discovered was much more: a collection of unique clams, worms and mussels thriving without sunlight.

These were lifeforms in which bacteria played a central role at the base of a food web that derives its energy from chemicals and not photosynthesis.

Since then, other deep-sea communities have been discovered and documented throughout the world, with hundreds of new species examined and named.

The Oceanus article also describes in some detail the just-completed renovation that has given Alvin new capabilities. The people responsible for various aspects of the make-over are interviewed in this special edition.

The first video on this page is by Woods Hole Oceanographic Institution celebrating Alvin’s 50th birthday. The second is a walk-around the newly renovated craft by Jim Motavalli, who usually writes about ecologically friendly automobiles.


What we know and don’t know about killer whales

Friday, June 27th, 2014

This week’s report about Puget Sound’s endangered killer whales contained little new information, but the intent was not to surprise people with important new findings. The report (PDF 14.3 mb), published by the Northwest Fisheries Science Center, was a nice summary of 10 years of research and ongoing efforts to unlock the secrets of the mysterious Southern Residents.

NOAA also released the video, at right, which sums up the report with great visuals. Make sure you go full-screen.

On Wednesday, I participated in a telephone conference call to link reporters with killer whale experts in our region. On the line were Lynne Barre, Mike Ford and Brad Hanson, all with NOAA Fisheries out of Seattle. I’ve been wrapped up with other reporting assignments, so the Kitsap Sun’s editors chose to run a solid story by Associated Press reporter Phuong Le. See Kitsap Sun, June 25.

Let me make a few quick observations:

Lynne Barre said one of the greatest mysteries, to her, is why killer whales suddenly go missing. It’s a vexing problem, and I always get a little nervous when the whales return in the spring. One year, six of the Southern Residents failed to show up. It was a real blow to the close-knit orca community and to the struggling population, and I’ve never forgotten the dismay of everyone who cared about these animals.

Healthy killer whales seem to go missing as often as elderly or sick ones. Only a few bodies ever wash up on the beach. Even when one is found, the cause of death often remains uncertain, as in the case of L-112, found to have died of “blunt-force trauma” from some unknown object.

Much more needs to be learned about disease in the animals, Lynne said. Future research could involve more tissue biopsies and breath samples in an effort to identify early signs of disease.

For Brad Hanson, another mystery is the whales’ seemingly unpredictable behavior and their “fundamental relationship with prey.” We all assume that their primary goal in life is to find fish to eat, but how good are they at this essential task? Pretty good, I would guess. Often before we learn that chinook are abundant off the Washington Coast, we find out that the killer whales are already there.

Maybe the reason the whales have been spending so much time away from Puget Sound the last couple years lies in the lower returns of Fraser River chinook, which pass through the San Juan Islands in the summer. Scale and fecal samples have shown that Fraser River chinook are the most consistent prey of the resident orcas.

In previous conversations, Brad has told me that he would love to communicate with the whales, to find out who is in charge and why a group of animals may suddenly turn around and go in the opposite direction. Howard Garrett of Orca Network recalls a time when all three Southern Resident pods were in the Strait of Juan de Fuca heading into Puget Sound. Suddenly K and L pod turned back, while J pod continued on. Howie says it was as if they knew there were not enough fish for the entire population, so J pod went on alone, saying, “See ya later.”

Mike Ford wants to know why the population has not increased more than it has. Could it be some limitation in the ecosystem, such as the fact that other marine mammals — such as seals and sea lions — have been increasing and taking a sizable bite out of the available salmon population? We know that Northern Residents, who also eat fish, don’t overlap territories much with the Southern Residents. Living up north, the Northern Residents have better access to some salmon stocks — including those that originate in Puget Sound. If the Northern Residents get to them first, the fish are not available for the Southern Residents — or so goes one hypotheses. The Northern Resident population has tripled in size, while the Southern Residents have stayed about the same.

Oddly enough, this potential competition for chinook salmon reminds me of exactly what is taking place with regard to commercial fishing enterprises. Washington fishermen complain that the Canadians are taking salmon that should get back to Washington. Canadian fishermen complain that Alaskans are taking salmon bound for Canada. Only Alaskan fishermen — and those who go to Alaska to fish — can catch a portion of the salmon going into Alaskan rivers as well as some destined to travel south.

One of the new things that did come up in Wednesday’s conference call was a renewed effort for U.S. killer whale biologists and managers to work with their counterparts in Canada. “We will be partnering with them on issues of salmon fisheries and how that may affect the whales,” Lynn said, adding that other cross-border efforts could involve vessel regulations and targeted research efforts.

During Wednesday’s conference call, nobody talked about the potential effects of military activities and the possible injury from Navy sonar until a reporter brought up the issue. The question was referred to NOAA Fisheries headquarters in Silver Spring, Md., where officials review the Navy’s operations and issue incidental take permits. That was the end of that discussion.

I know the Navy is conducting research in an effort to reduce harm to killer whales and other marine mammals. I get the sense, however, that more could be done immediately if connections were made between knowledgeable killer whale researchers in our region and those making decisions on the opposite side of the country.

SouthernResidentKillerWhalePhoto


Amusing Monday: A visit with wildlife via webcam

Monday, June 23rd, 2014

It seems kind of strange that we can spy on wildlife in a very personal way, thanks to modern technology.

The animals never notice the hundreds of humans peering over their shoulders via webcam. If they could know what is going on, I actually think they’d prefer the camera to the disturbance that even one person would create by crowding in that close.

It’s the time of year when many birds are active on their nests, so I thought I’d bring you some of the best videos on the web, weeding out those that are inactive or don’t have much going on right now.

The University of Montana operates two live osprey cams at part of its Montana Osprey Project. I believe the nest at Riverside Health Care Center in Missoula (shown in first video player) contains two chicks, while the nest at Dunrovin Ranch in Lolo contains three chicks.The high-quality video and sound make you feel you are right there with the birds.

Alberta Conservation Association and its sponsors have set up cameras to observe three prime nesting boxes for peregrine falcons in Edmonton, Alberta. Chicks have hatched in each nest, and we can watch (in real time) the mothers taking care of their little bundles of fluff. Each bird has a story listed with the video.

Chesapeake Conservancy is in charge of an osprey cam on Maryland’s eastern shore. The live video features Tom and Audrey, who have returned to the nest after spending the winter in South America. I have seen two chicks in that nest.

For a bird of a different character, check out the Puffin Cam at Seal Island National Wildlife Refuge in Maine, where Audubon’s Project Puffin operates a field station. The puffins on the island were wiped out by hunting in 1887, but they were reintroduced by bringing puffins from Newfoundland. More than 50 pairs nest there. (Three live videos are set up to show the puffins.)

If you are interested in watching brown bears feeding on salmon, stay tuned for live videos from Alaska’s Brooks River in Katmai National Park. The action should begin in July, according to information on the website. Meanwhile, you can watch recorded videos from previous times.

One of my favorite live cams is still Pete’s Pond (video player at right), a watering hole on Mashatu Game Reserve in Botswana, Africa. It began as a National Geographic project and is now operated by WildEarth, which features several other wildlife cams. Operators, working remotely, turn the camera to find the best action at any moment.

The Vancouver Aquarium has live cams showing:

If you’d like to see blacktip reef sharks and other fish, check out the video below from the National Aquarium in Baltimore, Md.


Watching the devastating decline of starfish

Tuesday, June 17th, 2014

I went to the beach last week to see some starfish with three trained volunteers. What we found was a scene of devastation on the pier and along the beach at Lofall, located on Hood Canal in North Kitsap.

Barb Erickson photographs a sea star afflicted with sea star wasting syndrome. Photo by Meegan M. Reid

Barb Erickson photographs a sea star afflicted with sea star wasting syndrome. Another infected star dangles by one arm.
Photo by Meegan M. Reid

What had been a large population of sea stars, as scientists call them, were now generally missing. Those that remained were mostly dead or dying. Healthy ones were in a minority.

Sea star wasting syndrome is now clearly present on our local beaches, just as it has affected hundreds of locations from Alaska to Mexico.

On Friday, I was fortunate to be in the company of three women who knew quite a bit about sea stars. They were careful in their observations and precise in their measurements, able to provide data to a network of observers measuring the progress of this disease along the West Coast.

But these three women — Barb Erickson, Linda Martin and Peg Tillery — also expressed their feelings of loss for the sea stars, a creature considered a key part of a healthy marine ecosystem.

As I reported in my story, published Sunday in the Kitsap Sun (subscription), Barb was the first to assess the situation as we arrived at the beach, comparing her observations to just two weeks before.

“‘Oh my!’ shouted Erickson as she reached the base of the pier and took a look at the pilings. ‘I can see right now that there are hardly any (sea stars) here. These corners were just covered the last time. Now these guys are just about wiped out.’”

“’Look at the baby,’ lamented Tillery, pointing to a tiny sea star. ‘He has only four arms, and he’s doing that curling-up thing … We had so much hope for the babies.’”

Melissa Miner, who is part of a coastwide monitoring program, told me that researchers are working hard to find a cause of the advancing affliction. But so far no consistent pattern has emerged to explain every outbreak.

starfish2

A leading hypothesis is that something is causing the sea stars to be stressed, weakening their defenses against the bacteria that eventually kill them. The stressor could be temperature, she said, or possibly other factors such as increased acidity or low-oxygen conditions. Perhaps another organism attacks the immune system, leaving the sea stars vulnerable to an opportunistic bacteria.

Researchers may find multiple pathways to the same conclusion: a dramatic decline in the sea star population, both at the local level and throughout their range along West Coast.

When I hear about a population crash, I think about the basic tenets of population dynamics. Is it possible that the sea star population has reached an unsustainable level, given the available food supply and other factors, and that widespread disease is a natural outcome? Will the decline of sea stars be followed by an overpopulation of mussels or other prey, leading to a decline in ecosystem diversity? How long will it take for the sea stars to recover? These are issues worthy of study in the coming years.

But I’m haunted by another prospect. Having seen our familiar starfish attacked by strange bacteria and turned to mush, what lies in store for other marine organisms? Could ecological stress and other mysterious pathogens lead to the devastating loss of other marine species? Who will be next?

Peg Tillery, Linda Martin and Barb Erickson take notes on the sea stars they see clinging to the Lofall pier. Photo by Meegan M. Reid

Peg Tillery, Linda Martin and Barb Erickson take notes on sea stars clinging to the Lofall pier.
Photo by Meegan M. Reid


For humpback whale, so many fish, so little luck

Wednesday, June 4th, 2014

This amazing photo of a humpback whale chasing a massive school of herring was taken in Prince William Sound by Rich Brenner of the Alaska Department of Fish and Game.

A lone humpback whale swims into a huge school of herring, which keeps moving away. Photos by Rich Brenner, Alaska Department of Fish and Game

A lone humpback whale swims into a huge school of herring, but the fish keep moving away.
Photo by Rich Brenner, Alaska Department of Fish and Game

Rich took the picture in April during an aerial survey of herring. He says he has observed many humpbacks feeding on herring during the spring survey, but this whale was not having much luck, probably because the water was so clear. As the whale approached, the herring kept moving away, creating odd patterns in the water.

“As I was watching the scene, I couldn’t help but think that the whale was expending a lot of energy and not receiving much in return,” Rich wrote me in an email. “But the shallow depth and clear water probably did not favor it.”

In the weeks prior to the flight, a large algae bloom covered this area near the village of Tatitlek. If the bloom had continued, the whale and much of the herring might have been difficult to see, he said.

“Thus, we were very pleased to get such a clear view of the situation and observe the movement of the herring along with the whale. The herring school undulated away from the whale, and they were able to keep a gap between them. Only once did we observe the whale lunging forward and getting under the school.”

The second photo, below, shows the whale lunging upward and possibly getting a mouthful of herring. The platform in the top photo is part of a frame for a net pen used to hold hatchery salmon before their release.

The spring herring survey measures the extent of the spawn along the shoreline, which is used to estimate the overall biomass in Prince William Sound.

Rich said he estimated that herring in this massive school would amount to several hundred tons. GIS experts will map the school to help construct a formal estimate of the biomass.

The state has not approved a commercial herring fishery in Prince William Sound since 1999. During the 1980s and early 90s, large numbers of herring were caught commercially, Rich said. Sometime around 1993, the population crashed and has never fully recovered.

“The reason for the depleted biomass, relative to the years when we had a commercial fishery, is a subject that has been hotly debated by scientists and others for the past 20 years,” he said.

As stated in an announcement by ADFG:

“Preliminary spawn estimates (from 2013) are 20.7 mile-days (south of Knowles Head) and 5.5 mile-days (north of Knowles Head), and 3.2 mile-days (Montague Island) for a total of 29.3 mile-days of spawn. This is fewer mile-days of spawn in PWS than in any year in which commercial fishing occurred since 1973.”

Another good source of information on herring is the Prince William Sound Science Center.

The humpback whale may have caught up with some of the fish, as it surges to the surface.

The humpback whale may have caught up with some of the herring, as it surges to the surface.


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"In the end, we will conserve only what we love, we will love only what we understand, and we will understand only what we are taught."Baba Dioum, Senegalese conservationist

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