Humpback Anglerfish
Although he seems like a character from Finding Nemo (which he is), the Humback Anglerfish is a deep sea savage in real life. Its super wide jaws are able to finish its prey in a flash after the luring device that grows out of its head uses bio-luminescence to trick its prey into coming close enough for an attack.
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Blue Ringed Octopus
Beautiful and deadly, this interesting creature is known as the Blue Ringed Octopus. Although they are small and colorful little guys, do not let that fool you. The power of the venom in their bodies is strong enough to kill almost 7 adult men, and no cure is available anywhere.