The Periyar Tiger Reserve spreads over 925 sq.km. of tropical evergreen, semi- evergreen and most deciduous forests. It lies in the districts of Idukki and Pathanamthitta (4 Kms from Thekkady). The sanctuary surrounds picturesque Periyar lake. There are 62 different kinds of mammals here, including many threatened ones. There are an estimated 53 tigers(2010) in the reserve. Tourists also come here to view the Indian elephants in the act of ablution and playfulness by the Periyar lake. Other inhabitants include gaur, sambar (horse deer), barking deer, mouse deer, Dholes (Indian wild dogs), mongoose, foxes, leopards. Nilgiri tahr,.the rare lion-tailed macaque, the Nilgiri Langur, the common langur, and the Bonnet Macaque.