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A cross-section of a nautilus shell is not only beautiful, it also is a great example of the chambered cephalopod shell. The projections splitting each chamber are the siphuncle tubes that allow gas and liquid to be transferred from chamber to chamber. 
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Chambered Shells

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Octopus, squid, cuttlefish, and nautilus all have differently shaped pupils— an octopus has a rectangular pupil.
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Octopus Eyes

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Auster gets ready to study fish predators at Gray’s Reef National Marine Sanctuary off the coast of Georgia.
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Auster Dives on a Rock Face

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Graph of magnitude 5 or greater earthquakes from 1900- April 2011.
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Graph of magnitude 5 or greater earthquakes from 1900- April 2011

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A silhouette of a small boat carrying 8 passengers on tranquil water, with a pink horizon.
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Carteret Islands Row

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Midway Atoll, where these photos were taken, is more than 2,000 miles from the nearest land.These photos portray baby albatrosses, which are fed the plastic by their parents. A chick can have an ounce of plastic in its belly and remain healthy; the dead ch
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Laysan Albatrosses’ Plastic Problem 2

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A round sea potato with hair-like spikes laying flat against its body.
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Sea Potato

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A brown sea hare sits in shallow ocean water.
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Sea Hare in the Intertidal Zone

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Seagrasses don't just provide shelter for free-swimming animals, but also are a habitat for non-moving organisms, such as these sea anemones.
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Anemone on Seagrass Blade

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A white crab hides among coral polyps of the same color.
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White Xenia Crab from Indonesia

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Comb jellies (such as this Bolinopsis species) are named for their combs: the rows of cilia lining their bodies that propel them through the ocean.
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Ctenophore Combs - Close Up

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Seahorses are the only fish species that can hold your hand! Unlike most fish that use their tails for swimming, seahorses, such as this big-belly seahorse (Hippocampus abdominalis), use their monkey-like tails to hold onto objects in their environment, li
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Seahorses Have Monkey-Like Tails

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