Gorilla

Gorillas are one of the largest primates or apes that are ground-dwelling and predominantly herbivorous in the world of Narnia. They are very intelligent, strong, wise, and loyal beasts to Aslan. Their fur color is usually black.

Gorillas move around by knuckle-walking, although they sometimes walk bipedally for short distances while carrying food, or in defensive situations if they have to fight an enemy, though Gorillas can run faster with their arms and legs.

Adult males range in height, from 1.65–1.75 metres (5 feet 5 inches to 5 feet 9 inches), and in weight around 140–200 kg (310–440 lb). Adult females are often half the size of a silverback, averaging about 1.4 metres (4 ft 7 in), and weight about 100 kg (220 lb).

It's unknown where these apes live in the land of Narnia, but it's possible that they inhabit the forests, as Gorillas enjoy to eat bananas, and other kinds of fruit.

Film
Since Gorillas didn't appear in the books, they appear in the 2005 film adaption of "The Lion, the Witch, and the Wardrobe."

After the Hundred-Year Winter ended, Gorillas were first seen in Aslan's Camp, where they were gathered with all the other Narnians, when the Pevensies and the Beavers arrived to meet Aslan for the first time. They fought in Aslan's Army against the White Witch's Army in the First Battle of Beruna. One was seen fighting a werewolf, and another one was seen climbing a rock and taking down a Minotaur.

One gorilla was also seen standing alongside a dog behind Edmund just after Jadis had arrived, and said that Edmund's blood belonged to her because he was a traitor, due to the law of The Deep Magic.