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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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Three distinct types of killer whale, or orcas, can be found in the Antarctic, each with a different habitat and diet preference. One type of orca preys almost exclusively on the Antarctic minke whale, another on seals, and the...
Researchers from the SOCAL-10 research partnership study the behavior of...
A Galapagos sea lion ( Zalophus wollebaeki ) rests on a beach in Ecuador...

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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...
Phoenix swimming with her calf in February 2007 in the Southeast calving grounds off the coasts of Georgia and Florida. Researchers track these highly endangered whales (there are only about 450 of...
The rough patches of skin known as callosities occur in unique patterns on all North Atlantic right whales and help researchers identify and track individual whales. This whale is named Phoenix. More...
Rachel Caauwe was one of a dozen artists who spent a recent Saturday sketching specimens from the Smithsonian's musky-scented marine mammal collection . Here she's shown drawing the remains of a...
There are more than 500 species of sharks swimming in the world’s ocean. Yet when most people think of these cartilaginous fish, a single image comes to mind: a large, sharp-toothed and scary beast...
The threat that climate change poses to polar bears has received a lot of attention, but they are not the only Arctic species at risk. Ice-loving seals, such as harp, hooded and ringed seals, are...
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...
A giant squid engages in a struggle for survival with a sperm whale. Giant squid beaks and other undigested pieces of giant squid have been found in the stomachs of sperm whales . More about the...
The Surtsey site in Iceland was inscribed on the World Heritage List in 2008. Surtsey is a new island, formed by volcanic eruptions that took place from 1963 to 1967. The site is unique, because it's...
Both humans and sea lions get sick from eating fish and shellfish that have been feeding on harmful toxic algae. Studying the sick sea lions brings scientists closer to understanding and preventing...
Marine mammals around the world face many challenges due to interactions with people, from overfishing and entanglement to vessel strikes and disturbance from human sounds. Dr. Brandon Southall...
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