A Cuvier's Beaked Whale
The Cuvier's Beaked Whale (Ziphius cavirostris) is an aquatic mammal indigenous to Earth. It is a cetacean species.
When Uhura tried to match the sound of the whale probe to the sound of an Earth animal aboard the Klingon Bird-of-Prey HMS Bounty, a Cuvier's Beaked Whale was one of the animals shown. (Star Trek IV: The Voyage Home)