Bottlenose dolphin

The bottlenose dolphin (Tursiops truncatus) was an aquatic mammal indigenous to Earth. It was a cetacean species.

When Spock 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 bottlenose dolphin was one of the animals shown. 

Harry Bernard successfully carved a wooden statue of a bottlenose dolphin with a device that emitted a pink/orange beam while in the forced custody of the Aldean natives Accolan and Leda. 

In 2365, a turbolift door close to a holodeck entrance was labeled Tursiops crew facility.