Flora
Hopea cordifolia, Memecylon petiolatum, Erythroxylon zeylanicum, and Jasminum angustifolium are endemic floral species recorded from the park. Hopea cordifolia is found along the river along with Terminalia arjuna. Panicum maximum and Imperata cylindrica are important food sources for the elephants. Chloroxylon swietenia, Berrya cordifolia, Diospyros ebenum, Adina cordifolia, Vitex pinnata, Schleichera oleosa, and Diospyros ovalifolia are the common taller trees. Terminalia bellirica and Phyllanthus emblica are plants of medicinal value found in the forest. Cymbopogon confertiflorus grass species and Grewia tiliifolia bushes are common in the grasslands.
Founa
Mammals
Udawalawe is an important habitat for Sri Lankan Elephants, which are relatively easy to see in its open habitats. Many elephants are attracted to the park because of the Udawalawe reservoir, with a herd of about 250 believed to be permanently resident. The Udawalawe Elephant Transit Home was established in 1995 for the purpose of looking after abandoned elephant calves within the park. A total of nine calves, on two occasions in 1998 and 2000, with another eight calves in 2002, were released in the park when old enough to fend for themselves.
The Rusty-spotted Cat, Fishing Cat and Sri Lankan Leopard are members of the Felidae family present in Udawalawe. The Sri Lankan Sloth Bear is seldom seen because of its rarity. Sri Lankan Sambar Deer, Sri Lankan Axis Deer, Indian Muntjac, Sri Lankan Spotted Chevrotain, Wild Boar and Water Buffalo are among other mammal species. Golden Jackal, Asian Palm Civet, Toque Macaque, Tufted Grey Langur and Indian Hare also inhabit the park. A study conducted in 1989 found that considerable numbers of Golden Palm Civets inhabit the forests of Udawalawe. Five species of mice also have been recorded from the park. The endemic Ceylon Spiny Mouse, known from Yala National Park, was recorded in Udawalawe in 1989. Indian Bush Rat and three species of mongooses are also recorded in the national park.
Birds
Udawalawe is also a good birdwatching site. Endemics such as Sri Lanka Spurfowl, Red-faced Malkoha, Sri Lanka Grey Hornbill, Brown-capped Babbler, and Sri Lanka Junglefowl are among of the breeding resident birds. White Wagtail and Black-capped Kingfisher are rare migrants. A variety of water birds visit the reservoir, including cormorants, the Spot-billed Pelican, Asian Openbill, Painted Stork, Black-headed Ibis and Eurasian Spoonbill.
The open parkland attracts birds of prey such as White-bellied Sea Eagle, Crested Serpent-eagle, Grey-headed Fish Eagle, Booted Eagle, and Changeable Hawk-eagle. Landbirds are in abundance, and include Indian Roller, Indian Peafowl, Malabar Pied Hornbill and Pied Cuckoo.
Reptiles and fish
Oriental Garden Lizards, Painted-lip Lizards, Mugger Crocodiles, Water Monitors, Bengal Monitors and 30 species of snake are found in the park. Garra ceylonensis is an endemic fish species recorded in park. Introduced Oreochromis spp., Giant gourami, Catla, and Rohu are important food fish species found in the reservoir.
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