Rough-toothed dolphin

The rough-toothed dolphin (Steno bredanensis), first described by Georges Cuvier in 1823, is the only living species in its genus and lives in deep warm and tropical waters around the world, generally well offshore beyond the continental shelf. Adults measure 2.09 to 2.83 meters in length and weigh 90 to 155 kilograms, with males larger than females, and are distinguished by a conical head with no clear crease between the beak and forehead, along with teeth that have a distinctively rough, ridged surface. The body is light gray on the flanks and darker gray on the back and dorsal fin, and older animals often show pink, yellow or white markings around the mouth. It forms social groups of about ten to twenty animals, dives to at least 50 meters and can stay submerged around fifteen minutes, using notably brief echolocation clicks, and feeds on fish such as silversides, sauries and houndfish along with squid and octopus.