The body shape, large teeth and large eyes of the crocodile shark suggest that it is a relatively active predator that hunts by night or in deep water (2) (3) (4). The diet is thought to include relatively large and active oceanic prey such as fish, squid and shrimp, and there is some evidence that this shark undertakes a daily vertical migration, following prey towards the water surface at night and away from it during the day. Although not regarded as dangerous to humans, the crocodile shark is reported to have a strong bite (2) (3).
Like other Lamniformes, the crocodile shark has an unusual method of reproduction, known as uterine oophagy, in which the embryonic young eat the other eggs and young within the female’s uterus (2) (3) (4) (6). The result of this cannibalism is the production of a small number of large, well-developed young (6), typically four per litter in this species (two surviving per uterus). The young are born live, and measure around 40 centimetres at birth (2) (3) (4) (6). Male crocodile sharks may reach sexual maturity at a minimum body length of 74 centimetres, and females at 89 centimetres (3) (6).