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In the late 1990's, researchers at the Woods Hole Oceanographic Institution (WHOI) invented the D-Tag —a radio device that can be attached by suction cups to a whale's back. Using a tiny underwater microphone,...
Killer whales ( Orcinus orca ) are master hunters, using speed, camouflage, and...
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In honor of Mother's Day, the Citizens of the Sea blog salutes ocean-going...
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How do we know where ocean animals swim day and night? Scientists are getting...

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Florida Manatee ( Trichechus manatus latirostris ) swimming within a fresh water spring on Crystal River in Florida. Note the tree roots on the right of the frame which make up a portion of this unique ecosystem. Fish aggregate...
The small vaquita ( Phocoena sinus ), a type of porpoise, usually only...
Three distinct types of killer whale, or orcas, can be found in the...

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The International Union for the Conservation of Nature ( IUCN ) maintains the Red List of Threatened Species , an inventory...
Since 1987, researchers have been tracking Phoenix, one of the last North Atlantic right whales living today. It's estimated that there are fewer than 500 of these whales alive today. Read her story...
Phoenix’s mother, Stumpy (#1004), was killed in a collision with a ship near Virginia in February 2004. She was pregnant with her sixth known calf. More about whales can be found in our Tale of a...
In the late 1990's, researchers at the Woods Hole Oceanographic Institution (WHOI) invented the D-Tag —a radio device that can be attached by suction cups to a whale's back. Using a tiny underwater...
Walruses use sea ice as platforms on which to nurse their young and launch their dives for clams and other bottom-dwellers. Each spring, walruses move northward to stay close to these perches as ice...
The crabeater seal ( Lobodon carcinophaga ) is found on the ice of Antarctica, but surprisingly they don't eat crabs! The seals primarily eat krill, tiny crustaceans that play a large part in the...
Bottlenose dolphins ( Tursiops truncatus ) are very social animals, and often travel and hunt in groups called pods. The most common is a nursery group of 5-20 dolphins made up of females and their...
The Smithsonian Marine Mammal team moves into action after a dead sperm whale is spotted floating off Cape Hatteras, N.C. Smithsonian marine mammalogist Dr. James Mead is in the water.
The small vaquita ( Phocoena sinus ), a type of porpoise, usually only reaches lengths of 5 feet (1.5 meters). They are only found in the Northern part of the Gulf of California off the coast of...
Toothed whales, like this common dolphin ( Delphinus delphis ) and its calf, live in social groups called pods. The mother and calf form a pair that shares a long-term bond. Read more about toothed...
The false killer whale (pdf) ( Pseudorca crassidens ) is a large dolphin that, despite its name, is not closely related to the killer whale, although they are both in the same family, Delphinidae ...
During the winter and spring months, tagged fur seals migrate thousands of miles in open water. Scientists are watching this species closely in order to determine the mystery of its population...
"Wild manatees in Belize are not used to humans. Living miles offshore in mangroves, they remain shy and elusive. After weeks searching and waiting for an opportunity to photograph them, I was...
This whale is entangled in fishing gear. Entangled whales often need human help to break free from the fishing gear . But the job is hard one that requires handling a small boat near the large (and...
The evolution of whales represents one of the great stories in macroevolution. It's a narrative that has mostly benefitted from an extraordinary series of fossils recovered from rocks around the...
A Florida manatee, Trichechus manatus latirostris , swims down a narrow channel into a freshwater spring late in the day.
Since 1987, researchers have been tracking Phoenix. More about whales can be found in our Tale of a whale featured story .
In 1996, at age nine, Phoenix has her first calf (North Atlantic right whale #2605) off the southeast coast of Florida. More about the right whale can be found in our Tale of a Whale featured story .
"A juvenile California sea lion performing close to the camera. The speed and elegance of these creatures is really unmatched in the oceans," wrote David Henshaw of his image , a winning selection in...
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