Fin whale model
The fin whale (Balaenoptera physalus) was a large aquatic mammal cetacean indigenous to Earth. It was a cosmopolitan species, with a range extending nearly from the North to the South Pole.
In 1986, the Cetacean Institute had a display with models and information thereon of different whale species, among them a fin whale. It was among the biggest whales in the display. (Star Trek IV: The Voyage Home)