The Sperm whale is the largest of all toothed whales (odontocetes), the Sperm whale gets its name from its spermaceti organ, a very large, oil filled chamber that occupies most of the animal’s enormous head. The body is relatively short and robust, with wrinkled surface appearance aft of the head. The head is very large, squared-off and blunt; in males, it accounts for about a third of the animal’s total length and mass and contains the spermaceti organ. They can grow up to 20 meters and weigh around 55 tons. The body is fairly uniform and dark grey or dark brown, though little streaks and spots may appear. Normally found as solitaries, pairs or in small pods of up to 24, while groups of 100-250 have also been observed. Their diet consists of epipelagic and mesopelagic cephalopods, including giant squid and also eats fish and occasionally crustaceans.