[citation needed] The average temperature in the sanctuary varies from 15°C to 25°C, with the hottest months being March and April.

[2] The tree species found in Idukki wildlife sanctuary include ceylon ironwood, thampakam (Hopea parviflora), large-flowered bay tree, wild jack (Artocarpus hirsutus), pali (Palaquium ellipticum), malampunna (Calophyllum polyanthum), Vernonia arborea, karuva (Cinnamomum verum), teak, Indian rosewood, vella maruthu (Terminalia paniculata), Grewia tiliifolia and Malabar kino.

[2] The sanctuary is also home to a large number of domestic animals including bulls, cows and buffaloes.

[4] The wildlife sanctuary is home to a number of birds including Greater Indian Hornbill, Heart-spotted woodpecker, Blue-bearded bee-eater, Malabar trogon, Black bulbul, Junglefowl, Laughingthrushes, Kingfisher and Peafowl.

The survey was conducted by the Kerala Forest Department in collaboration with Warblers and Waders, a consortium of bird and nature lovers.

The survey on butterflies, birds, tortoises and ants was conducted by the Kerala Forest and Wildlife Department and the Travancore Natural History Society.