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Vampire squid ( Vampyroteuthis infernalis) have eight arms and two filaments. The strategy isn't restricted to squids of their size or habitat, either - Hawaiian bobtail squid ( Euprymna scolopes), which average just over an inch in length, bury themselves in the sand of shallow waters, where they wait to attack shrimp, prawns and even small octopuses with their tentacles. Despite that degree of armament, colossal squid are ambush predators, preferring to sit and wait for unsuspecting prey to come close enough to be grabbed.
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In the case of colossal squid, which live in the cold waters of the Southern Ocean around Antarctica, the arm hooks are rigid and set into dense musculature, whereas the tentacular hooks can rotate in place.
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Some squids, like colossal squid ( Mesonychoteuthis hamiltoni) - which weigh a whopping 1,100 pounds ( 500 kilograms), almost twice as heavy as giant squid - have hooks that line both their arms and tentacles. "And the hooks also help them to pull the prey to them, whereas the octopods would mostly use their arms for walking." "In the water column, they'd be feeding on things like shrimp, which are quite fast, so they need to grab them," said Taite, who employs DNA barcoding to study cephalopod evolution and family trees.