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Not all slugs (snails without shells) are slimy brown pests found in your backyard garden. In the ocean they come in a huge variety of colors — some match the background and are hard...
In a decade long project, which ended in October 2010, scientists with the...
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From the giant squid to microscopic squid babies, squids are beautiful and...
Since summer 2013, starfish along both coasts of the United States have been...

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“Upon returning from the reef after a night dive, I swam toward a bright reflection and came eye-to-eye with this beautiful, curious squid," said Charles Viggers, a Nature's Best photographer. Squids have organs in their skin...
This ctenophore (a stingless jellyfish-like animal) is native to the east...
It's a pygmy seahorse ( Hippocampus bargibanti ), found in Indonesia's...

DIVE DEEPER

Giant squid live up to their name: the largest giant squid ever recorded by scientists was almost 43 feet (13 meters) long,...
It is a well-known fact that for animals living in the deep sea, food can be scarce. The food that is around usually rains down from above as dead animals and organic particles from plankton living...
You may not think of the ocean as a pharmacy but scientists are developing exciting new medicines from the sponges, corals, and other marine organisms found in the sea. Explore other videos that...
Amidst the bright blue tufts and the dark blue fringes of the beautiful Risbecia tryoni , you might not even notice the red emperor shrimp. The two animals are native to the Indo-Pacific region, and...
Two California market squids ( Loligo opalescens ) mate in the waters off of California's Channel Islands. While spawning, the male's arms blush red as he embraces the female, a warning to other...
Many expeditions in the Arctic reveal new species, such as this jellyfi sh Bathykorus bouilloni , which, strangely, has only four tentacles! Dr. Kevin Raskoff from California State University,...
Ochre seastars ( Pisaster ochraceus ) feed on invertebrates, such as coral and shellfish, like the mussels pictured here. The starfish forces open the shell with suction disks on the underside of its...
Found in Arctic waters, this rare deep-water species of larvacean , Oikopleura gorskyi , eats by filtering particles from the seawater it drifts through. Larvaceans build 'houses' around themselves...
This brightly colored squat lobster collected in Moorea is a common find among the coral heads. Although called lobsters, this group of crustaceans is more closely related to hermit crabs than to...
The open ocean is surprisingly barren to the naked eye. Every now and again you will encounter a school of fish and their attendant predators, but most of the life that you find is gathered around...
White abalones are slow-moving, algae-eating mollusks. Rapid overharvesting since the 1970s has resulted in white abalones becoming the first marine invertebrate listed as endangered on the...
The European green crab ( Carcinus maenas ) has spread far beyond its native continent, to waters off North and South America, Asia and Australia. It's a voracious eater and poses a nuisance to...
Editor's Note: See more information and details about the organisms displayed in the slideshow here . Researchers who come to Curaçao to take part in DROP ( Deep Reef Observation Project ) aren’t...
This red octopod ( Stauroteuthis syrtensis ) shines in a novel way. Suckers stretching in a single row down each arm flash on and off. The glowing-sucker octopod drifts through deep waters off the...
Census of Marine Life researchers discovered this unusual transparent sea cucumber ( Enypniastes sp.) in the Gulf of Mexico at 2,750 meters depth. It creeps forward on its tentacles pretty slowly, at...
A male mudflat fiddler crab ( Uca rapax ) waves its huge claw to impress females and threaten competitors. Only the males have the large claw. When the tide is high, fiddler crabs retreat to their...
Massachusetts ceramics artist Joan Lederman glazes her work —including this bowl—with deep sea sediments. Some contain tiny single-celled organisms called foraminifera. Lederman has noticed that...
Giant clams are one of the many wonders of coral reefs. They can grow up to five feet wide, weigh over 400 pounds, and live for 100 years! They power all that bulk by filter feeding microbes and...
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