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The thick internal shell of a cuttlefish is called a cuttlebone. It is made of calcium carbonate and contains numerous gas- and/or water-filled chambers.
The eyes of the cuttlefish are extremely well designed. Its pupils are “w” shaped, and they can focus both forward and backward, giving the cuttlefish all around protection. When frightened or attacked, the cuttlefish releases ink that forms a dense cloud in the water column, allowing it time to escape.
CLASS: Cephalopoda (octopuses and squids)
ORDER: Sepiida (true cuttlefishes)
FAMILY: Sepiidae (true cuttlefishes)
GENUS/SPECIES: Over 100 different species in three genera
Size: Varies depending on species
Diet: Small fish, crustaceans, and mollusks
Habitat: Shallow temperate and tropical waters near the shores