Physeteridae is a family including just three living species of whales the Sperm Whale in the genus Physeter, the Pygmy Sperm Whale, and Dwarf Sperm Whale in the genus Kogia. In the past, these genera have sometimes been united in a single family. Physeteridae, with two Kogia species in a subfamily however recent practice, is to allocate the genus Kogia to its own family. The very large Sperm Whale reaches lengths of over 18 meters and weights in excess of 53000kgs. Physeter has an enormous head equaling 35% of the length of the body.

 

Author: C Evangelista