Year of compilation: 2004
AVIFAUNA: Kerala’s avifauna is well represented within the Park. Two hundred species of birds have been recorded (Jayson 1990, Basheer and Nameer 1990). Four globally threatened species are found here. The Nilgiri Wood-Pigeon Columba elphinstonii is an uncommon bird (Zacharias and Gaston 1999, BirdLife International 2001), even in this well protected forest. The Broadtailed Grassbird Schoenicola platyura has a wide range in the Western Ghats but is uncommon everywhere. Santharam (1996) found it in the Poochipara area in December 1990. The site lies in the Western Ghats Endemic Bird Area (EBA) (Stattersfield et al. 1998). In this IBA, all the 16 endemic or restricted range species have been recorded. Flocks of Wynaad Laughingthrush Garrulax delesserti are sighted up to an elevation of 1,700 m. Above that, it seems to be the range of the Nilgiri Laughingthrush Garrulax cachinnans. Vijayan et al. (1999) also found this species in the upper reaches. Both the species confine themselves strictly to their respective altitudinal ranges. Nilgiri Flycatcher Eumyias albicaudata, a Near Threatened species, is common in the foothills of the National Park. Silent Valley is not only a paradise for local species, but it also host a large number of forest migrants in winter, from the Himalaya and beyond. Some of the forest birds noted are Tickell’s Leaf Warbler Phylloscopus affinis, Large-billed Leaf Warbler Phylloscopus magnirostris, Western Crowned Warbler Phylloscopus occipitalis, Rufous-tailed Flycatcher Muscicapa ruficauda, Brown-breasted Flycatcher Muscicapa muttui and Blueheaded Rock-thrush Monticola cinclorhynchus. This site lies in Biome-10 (Indian Peninsula Tropical Moist Forest) where 15 species are considered as representative of this biome’s assemblage. Nine of these species have been recorded from Silent Valley NP. Only those species which live in comparatively drier habitats are not found here, for example, the Small Greenbilled Malkoha or Blue-faced Malkoha Phaenicophaeus viridirostris, a bird of scrub and secondary jungle, and the Jerdon’s Nightjar Caprimulgus atripennis, a bird found in scrub forests, edges of moist forests and secondary growth. Silent Valley NP has been selected as an IBA as it qualifies three criteria (A1, A2, and A3) and more importantly, it has one of the finest undisturbed forests left in the Western Ghats. This famous forest has significant populations of many threatened and endemic birds. It also adjoins another IBA, Mukurthy NP in Tamil Nadu.
OTHER KEY FAUNA: The faunal diversity is very high and includes a number of endemic and threatened species. Some 26 species of mammals, excluding bats, rodents and insectivores, have been recorded (Balakrishnan 1984). Notable species include Nilgiri Langur Trachypithecus johni, Lion-tailed Macaque Macaca silenus, Tiger Panthera tigris, Leopard P. pardus, Jerdon’s Palm Civet Paradoxurus jerdoni, Wild Dog Cuon alpinus, Nilgiri Marten Martes gwatkinsi, Asian Elephant Elephas maximus, Gaur Bos gaurus and Nilgiri Tahr Hemitragus hylocrius, some of which are endemic to the Western Ghats. Estimates of large mammal populations are provided by Balakrishnan (1984). Six species of bats have been recorded, of which Peshwa’s bat Myotis peshwa and Hairy-winged bat Harpiocephalus harpia are considered rare. Amphibians total 19 species, lizards 9 species and snakes 11 species (Kerala Forest Department 1990). Notable records are two fishes (Holaloptera pillae and Garra menimi) and two amphibians (the primitive caecilian Ichthyophis longicephalus and Malabar tree toad Nectophryne tuberculosa).
Lepidoptera comprise about 100 species of butterflies and about 400 of moths, of which 13 are endemic to South India, and now have very restricted distributions, mostly within the Western Ghats (Mathew 1990).
A large number of people in the Mannarghat plains depend directly on the perennial flow of water in Kunthipuzha. The whole cultural fabric of these people is woven around the fact that this river retains its flow even in the harshest of summer. Bharathapuzha, which receives the water from Kunthipuzha is dry, except for this lean flow through the summer heat. The greatest threat to the forest of Silent Valley has been warded off with the abandonment of the hydroelectric power project and dam and the consequent declaration of the National Park. At present, forest fires have assumed a major role as the destroyer of prime forest. Uncontrolled tourism activities can equally well destroy the forest environment. A constant check on all these major factors is essential to the well being of the National Park.
BirdLife International (2019) Important Bird Areas factsheet: Silent Valley National Park. Downloaded from http://www.birdlife.org on 27/06/2019.