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This family tree shows how the ancestors of whales moved gradually from land to sea. Early whales took advantage of abundant marine resources, feeding on the ocean's fish, squid and other larger food. Baleen...
For the last 150 years, paleontologists have debated the origins of the great...
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The blanket octopus can rip a poisonous tentacle from a Portuguese man-o-war...
Come one, come all! See the amazing, the astonishing, half-animal, half-plant!...

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Vertebrates evolved in the sea and eventually moved onto land. The ancestors of whales later returned to the sea, taking advantage of its rich food supplies. As early whales adapted to their new marine surroundings, a diversity...
These "elevator" rudists, an ancient bivalve, used one long heavy valve to...
Today, filter feeders like clams, sponges, krill, baleen whales, fishes, and...

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Whales swim, but their ancestors walked. Whales are mammals (like us) whose ancestors lived on land. Life probably began in...
Whales have existed for million of years. Watch this animation, from the Sant Ocean Hall , to see how they evolved from land-dwellers to the animals we know today. Discover more about whale evolution...
Sirenians , or seacows, are a group of marine mammals that include manatees and dugongs . Currently, only a single species of seacow is found anywhere in the world. However, the fossil record of...
When you're standing in a museum surrounded by fossils, you can almost imagine drifting through time to when long-extinct creatures swam the ocean. Found all over the world, these fossils can be read...
This family tree shows how the ancestors of whales moved gradually from land to sea. Early whales took advantage of abundant marine resources, feeding on the ocean's fish, squid and other larger food...
Vertebrates evolved in the sea and eventually moved onto land. The ancestors of whales later returned to the sea, taking advantage of its rich food supplies. As early whales adapted to their new...
What makes a top predator? Razor-sharp teeth? Speed? Strength? Size? Who is the most fearsome hunter? It depends on where and when you look.
Great White Sharks are stealthy hunters and the secret is in their skin. Shark skin is covered by tiny flat V-shaped scales, called dermal denticles, that are more like teeth than fish scales. These...
For a long time, scientists thought that some small tentacled fossils were early ancestors of jellyfish. But a new study has found that these ancient animals are actually related to an entirely...
This early whale was well suited to life at sea. But it also lived on land. An ancestor of the right whale , Maiacetus lived 49-40 million years ago. It had flipper-like limbs and webbed feet, like...
This summer, many of you have likely enjoyed feasting on crabs, be they blue, stone, or Dungeness, and a special treat will have been the big, easy morsels of claw meat. The size of this muscle is...
A video of the Palauan primitive cave eel ( Protanguilla palau ) swimming in the Pacific off the Republic of Palau . Jiro Sakaue, a Japanese research diver, first discovered the new genus and species...
In honor of Mother's Day, the Citizens of the Sea blog salutes ocean-going mothers everywhere. Especially a 60 year-old albatross named Wisdom. She holds the seabird records for both oldest bird and...
Dr. Stephen Cairns is a research zoologist and chair of the Department of Invertebrate Zoology at the Smithsonian’s National Museum of Natural History. His research focuses on the diversity,...
Today, filter feeders like clams, sponges, krill, baleen whales, fishes, and many others fill the ocean, spending their days filtering and eating tiny particles from the water. But when did the first...
These "elevator" rudists, an ancient bivalve, used one long heavy valve to anchor themselves in the sediment. They used their tentacles (shown here in pink) to filter food from the sea water. And...
For the last 150 years, paleontologists have debated the origins of the great white shark . Many believe that they descended from the 50-foot megalodon, also known as the megatooth shark (...
Scientists at the Smithsonian and partnering organizations have discovered a remarkably primitive eel in a fringing reef off the coast of the Republic of Palau . This fish exhibits many primitive...
This 1837 sketch is Charles Darwin’s first diagram of an evolutionary tree. It appears in his First Notebook on Transmutation of Species (1837).
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