Bluefin Tuna

Bluefin tuna is a common name used to refer to several species of tuna of the genus Thunnus.

Description
Tuna are some of the fastest marine animals in the world, attaining speeds of up to 80 kilometres per hour. Tuna can do this because, uniquely, they are warm-blooded-- while most fish are unable to regulate their body temperatures, Tuna species can, via organs called retia mirabilia-- a system also found in Humpback Whales. They are also capable of growing to huge sizes, occasionally reaching weights of upwards of 450 kilograms. Tuna usually live in large schools, and hunt smaller fish far som shore. Several species are currently regarded as threatened, due to overfishing from humans.