The Chinnar forests support a diverse variety of mammals, reptiles, birds and butterflies. The star among them is the Grizzled Giant Squirrel, a large tree squirrel. In Kerala, the Grizzled Giant Squirrel is found only in the riparian forest of the Chinnar Sanctuary. The rare Manjampatti White Bison, a gaur noted for its distinctive ash-grey color, is another special inhabitant spotted in the sanctuary.
Other important mammals found are the rare Rusty Spotted Cat, Nilgiri Tahr, Elephant, Tiger, Leopard, Gaur, Wild Boar, Sambar, Spotted Deer, Barking Deer, Porcupine, Wild Dog, Common Langur, Bonnet Macaque, Jackal, Sloth Bear, Nilgiri Langur, Jungle Cat, Bison, Spotted Deer and Sambar.
Leopards also live in the sanctuary but don’t assume that the tiger is an inhabitant of the sanctuary if you spot some. They are visitors from the neighboring forests. Bonnet Macaques, Elephants and Gaur are also present. White Bison has been recently sighted in the Chinnar plains. 28 species of mammals have been found in the sanctuary.