It is one of three extant species in the sperm whale superfamily, along with the pygmy sperm whale and dwarf sperm whale.
From the en.wikipedia.org
This autumn a dwarf sperm whale was spotted in Mounts Bay, Cornwall, while a pygmy sperm whale, its close relative, was found beached on Seil island, near Oban.
From the guardian.co.uk
Less commonly seen animals include cuvier's beaked whale, false killer whale, pygmy sperm whale, dwarf sperm whale, risso's dolphin, common dolphin, humpback whale and Bryde's whale.
From the en.wikipedia.org
Legislation proposed in Maryland, US, was named after Inky, a pygmy sperm whale who needed six operations after swallowing debris, the largest piece of which was a mylar balloon.
From the en.wikipedia.org
The Dwarf sperm whale prefers deep water, but is more coastal than the pygmy sperm.