Cuttlefish bones or cuttlebones are the internal calcareous or calcium-rich shell of the cuttlefish. Cuttlefish bones are the white, chalky, surfboard-shaped shells that often wash up onto beaches. They are all that remains after a cuttlefish has been attacked and eaten.
Some cuttlebones that are washed up onto beaches have teeth marks on them. These marks usually occur during the death struggle but are sometimes inflicted after death by hungry birds and fish while the shell is still floating in the ocean. Studying the bite marks may give some idea of the type of marine life found in that area.
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