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Two Southern Resident killer whales.
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Southern Resident Killer Whales

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This tentacle belongs to a blue button. While it has a central “float” with streaming tentacles like typical jellyfish, the blue button is a colony of many small hydroid animals.
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Blue Button Tentacle

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A rendering of an ocean scene as it may have looked 65 million years ago, when an astroid fell to Earth and triggered a mass extinction event.
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Cretaceous-Paleogene Boundary (65 Million Years Ago)

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Coral scientist Dr. Amy Baco-Taylor observed corals like these on her first submarine dive to a deep-sea coral bed off the coast of Hawaii.
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Deep-Sea Coral Community

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Ancient sea cow vertebra found in the Gatun Formation in Central America, Panama
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Ancient Sea Cow Vertebra

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The Lagoons of New Caledonia: Reef Diversity and Associated Ecosystems site in France was inscribed on the World Heritage List in 2008. The site features an exceptional diversity of coral and fish species and a continuum of habitats from mangroves to se
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Lagoons of New Caledonia: Reef Diversity and Associated Ecosystems, France

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A bull shark's ability to prey on many different species is helped by its capacity to survive in both freshwater and saltwater.
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Swinging for Bull Sharks

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The Cocos Island National Park site in Costa Rica was inscribed on the World Heritage List in 1997. Cocos Island's position as the first point of contact with the northern equatorial counter-current and the myriad interactions between the island and the su
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Cocos Island National Park, Costa Rica

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Smithsonian Zoologist Dr. Clyde Roper in front of the museum's stored cephalopod collection.
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Smithsonian Cephalopod Collection

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Japanese scientists videotaped this female giant squid, alive, at the water's surface
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Caught on Video: Giant Squid

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What is coral? The answer is coral is an animal. This cutaway diagram of a coral polyp shows the location of its photosynthetic algae, or zooxanthellae, which coral needs to survive.
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What Is Coral? A Coral Polyp and Zooxanthellae

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This queen parrotfish scrapes algae from Caribbean reefs with its parrot-like beak.
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From Despair to Repair: Protecting Parrotfish Can Help Bring Back Caribbean Coral Reefs

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