Chinnar Wildlife Sanctuary has the only population of Grizzled Giant Squirrel in Kerala. The sanctuary is also home to Malabar Giant Squirrel as well as Common Flying Squirrel. Among the Primates the sanctuary is home to Bonnet Macaque, Hanuman Langur, Nilgiri Langur and Slender Loris. Apart from the Rare Rusty Spotted Cat and Nilgiri tahr, the important mammals found in the Sanctuary are 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 etc.
The Chinnar plains have groups of Gaur, Spotted Deer and Sambar. Tigers are present but their home ranges extend to the neighbouring forests. Leopards are common. There is marked seasonality in the movement of Elephants and Gaur. The legendry white bison has been sighted in the Chinnar plains. Such Albino Gaur has been reported from Kodaikanal area, Indira Gandhi Wildlife Sanctuary and Chinnar Wildlife Sanctuary. Since it was earlier seen in adjoining Manjampetti valley these white ones were also called “Manjampatti White Bison”. Spotted deer is the dominant herbivore in number.