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Humpback whales ( Megaptera novaengliae ) are the most abundant baleen whale in the nearshore waters around the Antarctic Peninsula. They, along with millions of penguins, seals, seabirds, and other whales, feed primarily on...
In the late 1990's, researchers at the Woods Hole Oceanographic Institution (...
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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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 calves—although occasionally...
The North Atlantic right whale is one of the world's largest animals, but...
A 2010 study of IUCN's Red List of Threatened Species found that one-fifth...

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Stretching up to 16.8 meters (55 feet) long and weighing up to 62 tons (70 tons), the North Atlantic right whale is one of...
A female bottlenose dolphin ( Tursiops sp. ) carries a sponge, which it uses as a tool to dig up prey from the seafloor. The only dolphins known to use sponges as tools this way are the female...
Male northern elephant seals face off on the beach by vocalizing through their extended noses, called proboscises. Every winter, when the seals return to the beach where they were born to breed,...
This magnified photo provides a close-up look at copepods—tiny crustaceans that right whales feed on. There are many species of copepods that live throughout the water column, from floating at the...
Every North Atlantic right whale has a pattern of callosities unique to that individual. This distinctive pattern provides a very visual, convenient tool that researchers can use to tell one...
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...
North Atlantic right whales and ocean-going vessels often cross paths. Researchers have worked to show the interactions between whales and ships in order to protect the whales from collision. More...
Chilean and Smithsonian paleontologists study several fossil whale skeletons at Cerro Ballena, next to the Pan-American Highway in Atacama Region, Chile, in 2011. The fossils were discovered when the...
“At night, spotted dolphins move offshore into the Gulf Stream’s deep waters in search of squid.” -- Nature's Best photographer, Andrew Sallmon. See more beautiful ocean photos in our slideshow of...
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