The blue whale (Balaenoptera musculus) was an aquatic mammal indigenous to Earth. It was a cetacean species.
Blue whales were the largest creatures ever to inhabit the Earth. By the late 20th century, they had nearly been hunted to extinction by Humans.
Information on, a model of a mother with her baby from, and a global map showing the range of this species was included in a display of other baleen whales that was seen in the Cetacean Institute in 1986. (Star Trek IV: The Voyage Home)