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Porcelain crab on anemone at Pescador Island, Cebu, Philippines.
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Porcelain Crab and Anemone

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Emperor shrimp, and two nudibranches at Dinah’s Beach, Papua New Guinea.
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Nudibranch With a Shrimp Partner

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A white nudibranch with orange-colored tips.
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A Fiery Nudibranch

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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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Throughout their lifecycle, jellyfish take on two different body forms: medusa and polyps. Polyps can reproduce asexually by budding, while medusae spawn eggs and sperm to reproduce sexually.
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Jellyfish Lifecycle and Reproduction

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A shining jingle shell on the sand.
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Jingle Shells

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A bright yellow long-snouted seahorse.
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A Cold-Water Seahorse

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This day octopus (Octopus cyanea) has shaped itself like seagrass or some coral so hide from predators or stalk prey.
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Camouflaged Octopus Blends In

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This tentacle was left behind by the first giant squid caught on film.
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Squid Tentacle

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This halimeda crab’s disguise did not fool researchers in Moorea where it was collected.
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Halimeda Crab

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Chrysaora melanaster is a jellyfish found in the Arctic.
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Arctic Sea Jelly

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The black sea nettle jellyfish can grow to twenty-five feet long.
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The Black Sea Nettle

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