Sabre-toothed gorillas were a species of aggressive primate native to an unnamed planet, which the Second Doctor once compared to Canada.
The Doctor, John and Gillian encountered a tribe of sabre-toothed gorillas, but were rescued by a professor, who had developed a substance he called squidge. The group used weapons made of squidge to hold off the gorillas until they could make their way back to the TARDIS. (COMIC: The Sabre-Toothed Gorillas)
Sabre-toothed gorillas were one of the creatures the Tenth Doctor warned Martha Jones about that could be outside the TARDIS doors when they arrived on Myarr. (TV: The Infinite Quest)