Sperm whale skull

Sperm whales are marine mammals of the order Cetaceae and family Sperm Whales. The body length can reach 18 meters, and the weight exceeds 50 tons. It is the largest toothed whale, with its head accounting for one-third of its body. The head is huge, the lower jaw is small, and only the lower jaw has teeth. No dorsal fin; The diving ability is extremely strong, making it the deepest and longest diving mammal. The body shape is like a fish, breathing through the lungs. The neck is short, and the head seems to be connected to the trunk; Cervical Union; The nostrils are orifices located at the snout, with the forelimbs forming fins, the forearms degenerate, the palms lengthen, and the number of toes increases, but the toes and claws are not visible from the outside; Degeneration of hind limbs; Tail like a fish, with horizontal tail fins, swimming by swinging the tail.