In the novel, Kala is a female in a band of Mangani, a fictional species of Great Ape intermediate between real life chimpanzees and gorillas. She saves the infant Tarzan from the murderous fury of Kerchak, the mad leader of the ape band, after the latter kills Tarzan's human father. Kala goes on to rear the human baby as her own while protecting him against Kerchak and her own mate, Tublat. After Tarzan reaches adulthood, Kala is killed by a native African hunter, who is afterward killed by Tarzan in revenge.
In Disney's Tarzan (1999) and its direct-to-video sequel, Burroughs's "Great Apes" are gorillas, and Kala is the mate of Kerchak (a much more benign figure in the film) rather than Tublat, who himself appears in the Disney animated TV series as the rogue tyrant instead. In the film's retelling Tarzan's parents are killed by Sabor the leopard, and Kala saves the infant Tarzan from Sabor, not Kerchak. She does not die in the movie. Kala was voiced by actress Glenn Close.