Sperm whales (Physeter macrocephalus) at the surface, showing their small dorsal fins and spouts of exhaled breath. The sperm whale is the largest toothed whale, with males reaching more than 20 metres in length. The sperm whale was widely hunted for its spermaceti until it was given full protection in 1985. It is still listed as a Vulnerable species. Filmed in the Azores.