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![A photo of a squid using bioluminescence to hide in the deep sea.](/sites/default/files/styles/3_2_small/public/2023-11/2_09_P08_G10_Abraliabigger.jpg.webp?itok=-_l8Wwm4)
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Bioluminescence
You may have seen the sparkle of fireflies on a summer’s night. The fireflies......![It's a pygmy seahorse (Hippocampus bargibanti), found in Indonesia's biodiverse Coral Triangle and one of the smallest seahorse species in the world! They can change colors like a chameleon to blend into their environment. This helps to protect them from p](/sites/default/files/styles/3_2_small/public/2023-11/1b_-_Hippocampus_barbiganti-1000px.jpg.webp?itok=z2eDWR3W)
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Can You Spot the Seahorse?
It's a pygmy seahorse (Hippocampus bargibanti), found in Indonesia's biodiverse......![This day octopus (Octopus cyanea) has shaped itself like seagrass or some coral so hide from predators or stalk prey.](/sites/default/files/styles/3_2_small/public/2023-11/octopus-camouflage_0.jpeg.webp?itok=MpqcDTwV)
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Camouflaged Octopus Blends In
Octopuses can change the texture and color of their skin to blend in with their......![Winner of the ‘best camoflauge’ contest, the nudibranch Scyllaea pelagica is betrayed only by motion.](/sites/default/files/styles/3_2_small/public/2023-11/Scyllaea2small.jpg.webp?itok=7u96O3qR)
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Seaslug Camouflages in Seaweed
Winner of the ‘best camouflage’ contest, the nudibranch Scyllaea pelagica......![Brown Grass Shrimp Brown grass shrimp on a floating piece of seaweed.](/sites/default/files/styles/3_2_small/public/2023-11/Leander2.jpg.webp?itok=4tx7yovr)
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Brown Grass Shrimp
Another common species of sargassum shrimp, Leander......![The Japanese spider crab may be big but it is not invincible.](/sites/default/files/styles/3_2_small/public/2023-11/6968078569_bf41ccb8fe_b.jpg.webp?itok=eJfx82jQ)
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Japanese Spider Crab
The Japanese spider crab is a large catch for any fisherman. With a leg span of 13......![The blue lined octopus can be deadly, so it is best to stay away.](/sites/default/files/styles/3_2_small/public/2023-11/Blue_Lined_Octopus.jpg.webp?itok=repXNtwG)
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The Dangerous Blue Octopus
The blue-lined octopus may be small, growing to at most 15 cm, but it can be......![Jellies in the Class Hydrozoa are transparent and easily overlooked.](/sites/default/files/styles/3_2_small/public/2023-11/hydromedusae_aglantha.jpg.webp?itok=2vFC8pso)
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Transparent sea jelly
Many jellyfish in the class Hydrozoa, such as this hydromedusa Aglantha digitale,......![A veined octopus sits inside a vacant bivalve shell, which it uses as a portable shelter, in the Philippines. This is one of the few examples—if not the only example—of tool use in invertebrates.](/sites/default/files/styles/3_2_small/public/2023-11/JeffreydeGuzman_Coconut_Octopus_Shell.jpg.webp?itok=BuToaJCh)
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Veined Octopus at Anilao Batangas Pier, Philippines
The veined octopus (Amphioctopus marginatus), also known as the coconut octopus,......![Photograph of a transparent comb jelly against a dark sea.](/sites/default/files/styles/3_2_small/public/2023-11/6-zooplankton-full_1.jpg.webp?itok=satEhX1O)
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Bioluminescent Comb Jelly
Like many deep sea creatures, this tiny comb jelly (Bathocyroe fosteri) has a......![This crab was collected on a NOAA/MAR-ECO cruise to the Mid-Atlantic Ridge in 2009.](/sites/default/files/styles/3_2_small/public/2023-11/Neolithodes2-full_1.jpg.webp?itok=60C60Yyc)
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Spiny Deepsea King Crab
This crab (Neolithodes sp.) was collected on a NOAA/MAR-ECO cruise to the......![Giant eyes spot prey. Huge claws grab the prey, and a tiny mouth rips it to shreds.](/sites/default/files/styles/3_2_small/public/2023-11/Phronima1-full_1.jpg.webp?itok=He3A8n0F)
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