N amed as such because in it was thought that the milky liquid wax produced in their big box-like head was part of the reproductive system. Black, often with white belly patches. Upper body black while flippers, belly and flanks are white or black. Dark grey with white colouration on chin and throat. Dark slate grey with paler grey to white on belly and throat.
Flippers have a distinctive white band.
Well shaped and graceful with a pointed head and a single prominent ridge from tip of upper jaw to blowholes. Black or grey and lighter underneath. At sea appear a light brown colour. A heavy, robust animal with a prominent beak and bulging forehead. Striking black and white pattern.