Zeltok gorilla

Zeltok gorillas were an otherwise unnamed sentient species of gorilla living on the planet in the 15th century. They became extinct when the planet self-destructed in 1465.

Although these gorillas did not speak, they used a type of gestural language and were adept at constructing buildings. They moved with great agility.

History
In the 15th century, the gorillas rescued a survivor of a humanoid battle against sentient Zeltok ants and brought him to their fortress stockade. They took care of him, and in turn, he became extremely loyal to them.

In 1465, a group of gorillas spotted the Galileo from the starship USS Enterprise (NCC-1701) and beckoned them to land in a clearing not far from their fortress. Later, when the ants began an assault on the fortress, the shuttle helped defend it with missiles, but the battle seemed hopeless. The Zeltok native vowed to stand by his friends to the end, and let the shuttle leave without him.