Tail flukes of a diving Sperm Whale @ Kaikoura, New Zealand
Sperm whale is the largest of the toothed whales and the largest toothed predator. Mature males average at 16 meters (52 ft) in length but some may reach 20.5 metres (67 ft), with the head representing up to one-third of the animal's length.
Sperm whales are believed to be able to remain submerged for 90 minutes and to dive as deep as 2,250 meteRs (7,380 ft), making them the second deepest diving mammal after Cuvier's beaked whale, which has been recorded at 2,992 metres (9,816 ft). More typical sperm whale dives are around 400 meteRs (1,300 ft) and 35 minutes in duration.