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The squid has two fins, a mantle, and a head that bears eight arms and two tentacles, each covered with suckers, which are armed with hooks or sucker rings.
The squid, like other cephalopods, has design features for jet propulsion under water. It expands its mantle cavity and sucks water into its body, then relaxes its muscles, which in turn forces the water out through its siphon. The direction of the siphon can be changed in order to control the direction of travel.
CLASS: Cephalopoda (octopuses and squids)
ORDER: Teuthida (squids)
FAMILY: 29 families in two suborders
SPECIES: About 500 species
Size: From 2 in (5 cm) to up to 50 ft (13 m),
including tentacles; average 24 in (60 cm)
Diet: Fish, crustaceans, and smaller squids
Habitat: All oceans worldwide