Despite their name, cuttlefish are not fish but molluscs. They belong to the class Cephalopoda, which also includes squid, octopodes, and nautiluses.
A cuttlefish can use its nervous system to change color at will. Not only can the cuttlefish blend in by shifting its hue, it can hypnotize prey before snatching it with two deadly tentacles.
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(thanks Cora)
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