A model of a killer whale
A killer whale
The killer whale (Orcinus orca) 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 killer whale was one of the lifeforms shown. (Star Trek IV: The Voyage Home)
Three huge models depicting a killer whale family were on display in the Cetacean Institute in San Francisco in 1986. (Star Trek IV: The Voyage Home)
In 2293, Captain James T. Kirk's quarters aboard the USS Enterprise-A featured a black and white painting of a pair of killer whales. (Star Trek VI: The Undiscovered Country)