The second & third highest mountains of the country namely Kirigalpotta & Thotupola respectively are found within the borders of the park. Park receives rainfall from both northeast & southwest monsoons as well as inter-monsoonal rains. Frequently occurring mist and clouds are one main source of precipitation. With annual precipitation of about 5000mm Horton Plains is the most important catchments are
a of the country. Three major rivers of the country            start from this area namely Kelani, Walawe & the Mahaweli the longest            river of the country. There is a slight dry period between January to            March. Due to altitude the area is comparatively cold. Mean annual            temperature is around 15�C and during colder months it will go down            further where it is cold enough to create ground frost.Park consists of montane cloud forests embedded in wet montane grasslands. Horton Plains has rich biodiversity. Most of the fauna and flora found in the park are endemic and furthermore some of them are confined to highlands of the island.
Forests are dominated by Calophyllum sp. & Syzygium sp. Giant tree            fern Cyathea sp. and colourful Rhododrendron are among the main            attractions. Park is also famous for beautiful flowers of endemic            Nellu (Strobilanthes sp.), Bovitiya (Osbeckia sp.), Binara (Exacum            trinervium) and many other orchid species. Endemic dwarf Bamboo (Arundinaria            densifolia) dominates the edges of the river while Chrysopogon            zeylanicum and Garnotia mutica dominate the grasslands.Though this was one of the best elephant habitats in the country they are locally extinct due to poaching & sports hunting occurred during the British colonial era. Leopard and Sambhur & wild boar are the most common large mammals in Horton Plains. Endemic Bear Monkey, Rusty- Spotted and Fishing cats, Otter, Black napped hare and Giant Squirrel are among other mammals. Many species of endemic & threatened rats & shrews are also found in the park. Diversity & endemicity of reptiles (Lizards) and amphibians are remarkably high.
Though this is cold highland plateau the bird diversity is very high. More than 70% of Sri Lanka’s endemic birds are found here.
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