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Killer whales ( Orcinus orca ) are master hunters, using speed, camouflage, and a variety of techniques to capture their prey. See how a different predator - the great white shark - finds its...
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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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Whales swimming in the ocean are never really alone. Even if one swims by...

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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...
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...
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 critically endangered Hawaiian monk seal ( Monachus schauinslandi ) is one of hundreds of marine species that can be found cruising the waters of Papahānaumokuākea, a chain of islands northwest...
A North Pacific right whale (Eubalaena japonica) swims in the Bering Sea.
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...
A white scar on Phoenix’s lip (at right) was caused by her entanglement with a fishing line. Learn more about the life of Phoenix, an actual North Atlantic right whale, in the Tale of a whale photo...
This illustration shows how fishing lines attached to traps and buoys on the ocean floor present a potentially deadly hazard to North Atlantic right whales. Freeing entangled whales involves a...
A manatee swimming in shallow waters. The West Indian manatee is listed on the IUCN's Red List of Threatened Species as Vulnerable. More about mangroves can be found in our Mangroves featured story .
A 2010 study of IUCN's Red List of Threatened Species found that one-fifth of the world's vertebrates (animals with backbones) are threatened with extinction, including this Hawaiian monk seal. The...
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...
“I took this photograph of spinner dolphins in calm waters off the Ogasawara Islands, an archipelago in the Pacific Ocean about 600 miles south of Tokyo.When the sun briefly broke through the clouds...
An adult giant squid struggles for survival in an encounter with a sperm whale - its only known predator. The whale will probably overpower and eat the squid. More about the giant squid can be found...
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