Flora
Wasgamuwa National Park exhibits one of the highest biodiversity among the protected areas in Sri Lanka. More than 150 floral species have recorded from the park. Cryptocoryne walkeri and Munronia pumila are two plants with economic value. Reservoirs and riverine forests support large number of fauna species. The forest consists of several layers. Chloroxylon swietenia, Manilkara hexandra, Elaeodendron glaucum, Pterospermum canescens, Diospyros ebenum, Holoptelea intergrifolia, Pleurostylia opposita, Vitex altissima, Drypetes sepiaria, and Berrya cordifolia are dominant trees in the emergent layer. Polyalthia korinti, Diplodiscus verrucosus, Limonia acidissima, Cassia roxburghii and Strobilanthes stenoden are common in other strata. Some 1,700 years old tamarind tree, "Oru Bendi Siyambalawa" (Sinhala for Canoes-moored-Tamarind) was situated in the park.
Founa
Wasgamuwa National Park is home to 23 species of mammals. The park is inhabited by a herd of 150 Sri Lankan Elephants. Marsh elephant (Elephas maximus vil-aliya) roams in the Mahaweli river area. Both monkeys found in the park, Purple-faced Langur and Toque Macaque are endemic to Sri Lanka. While Water Buffalo and Sri Lankan Axis Deer are common to observe, Sri Lanka Leopard and Sloth Bear are rare. Small Golden Palm Civet is another rare endemic mammal.
Number of bird species recorded from the park is 143. This includes 8 endemic species. Endemic Red-faced Malkoha is a resident bird in this national park. Sri Lanka Junglefowl is another endemic bird inhabits the park. Lesser Adjutant, Yellow-fronted Barbet, and Sri Lanka Spurfowl are the species that visit the reservoirs and streams of the national park. Peafowl, Painted Stork, Black-headed Ibis and Eurasian Spoonbill are the park's other aquatic birds. Rare Sri Lanka Frogmouth is can been here. Another rare species, Chestnut-winged Cuckoo is seen near the Mahaweli river.
Endemic and endangered Fejervarya pulla is one of the 8 species of amphibians of the park. Of 17 reptile species recorded in the park 5 species are endemic. Water monitor and Mugger Crocodile are common in the waterbodies of the park. Skinks Lankascincus spp., lizards Calotes ceylonensis and Otocryptis wiegmanni, and serpent Chrysopelea taprobanica are the endangered reptile species. Endemic Garra ceylonensis and Combtail are among the 17 fish species reside in the aquatic habitats of the park. Of the park's 50 butterflies, 8 species are endemic.
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