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A shell placed in seawater with increased acidity slowly dissolves over 45 days.
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Shell Dissolves in Seawater

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Artistic rendering of an ancient shark, Helicoprion.
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Illustration of Helicoprion

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Census researchers discovered this sea cucumber (Enypniastes sp.) in the Gulf of Mexico.
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Transparent Sea Cucumber

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The largest of the Atlantic shearwaters, Cory's Shearwater (Calonectris borealis) can often be spotted by its casual wingbeat and gliding flight.
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Cory's Shearwaters Bicker

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Band-rumped Storm-petrels (Oceanodroma castro) are quite a bit larger and heavier than Wilson's storm petrels, but share their amazing sense of smell, which they use to find food that may be miles away.
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Band-rumped Storm-petrels

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The spanish dancer is one of the largest species and best swimmers of the nudibranchs.
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The Spanish Dancer

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Antarctica is almost entirely covered by ice sheets up to two miles (3 km) thick, which contain roughly 70% of the world’s freshwater.
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Ross Sea Ice Shelf

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Leatherback turtles (Dermochelys coriacea) are the largest sea turtles, growing as long as six and a half feet (2 m) and weighing some 2,000 pounds (900 kg). They’re unlike the other marine turtles in two important ways: they have a thick leathery carapa
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Leatherback Turtle

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Kemp’s ridley turtles (Lepidochelys kempii) are the smallest sea turtles, weighing only 100 lbs (45 kg). Adults spend most of their time in shallow coastal areas in places with mud, sand, or gravel bottoms—often in seagrass beds. They eat swimming crab
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Kemp's Ridley Turtle

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Mantis shrimp have built-in polarized vision to help them see underwater—and maybe even communicate.
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Built-in Underwater Polarized Lenses?

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The right whale Phoenix, and her calf, swimming off the coast of Florida.
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Phoenix and Her Calf Sighted in February 2012

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A photo of oceanographer Xavier Pastor aboard an Oceana research vessel surrounded by ice in the Baltic Sea
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Oceanographer Xavier Pastor

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