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A small shark, Isistius brasiliensis, that tears circular chunks of flesh from its prey.

side view of a slender brown shark with small fins and large green eyes, with a pencil alongside to show that it is of small size

A small shark, Isistius brasiliensis, that tears circular chunks of flesh from its prey.

world map with blue areas scattered through the Atlantic, Indian, and Pacific Oceans, excluding the polar regions

A small shark, Isistius brasiliensis, that tears circular chunks of flesh from its prey.

The cookiecutter shark has a short, rounded head with large, anteriorly placed eyes and a transverse mouth.