Trek one of the finest natural rain forests in the world wich has been identified as a UNESCO world heritage site as well as being a man and biosphere reserve. Trek through dense greenery of lofty trees, intertwined with shurbs, woody climbers, vines and smaller trees, experience a hot - spot of endemic spec ies which includes over 50% of Sri Lanka's endemic trees and woody climbers, mammals, birds, butterflies, reptiles, insects and rare amphibian species.
There are records of 21 species of snakes, including the Python (Python molurus), found in Sinharaja. Five species of lizard found in Sinharaja are the arboreal Green Forest Lizard (Calotes calotes), the high - pitched whistling Whistling Lizard (Calotes liolepis), the Hump - nosed Lizard (Lyiocephalus scutatus) with its gular fold, the Earless Lizard (Otriocephalus scutatus) and the Rough Horned Lizard (Cer ataphora aspera). The rare Horned Lizard is restricted to parts of Sri Lanka’s wet zone below 900m elevation. The Water Monitor (Varanus monitor) is found in Sinharaja but the Land Monitor (Varanus bengalensis) has not been seen at this elevation.
Sinharaja has a complex vegetation s tructure. This is the same as in an intricate rain forest ecosystem. At first glance, the forest seems to be a chaotic muddle of vegetation. However, a closer look reveals that the vegetation can be categorized on the basis of several factors such as life - forms (trees, shrubs, herbs and woody climbers), a strata or groups of plants living under similar conditions of light and moisture with each group having its own “life - style” There are many ‘layers’ of the forest – the canopy, sub canopy, under - storey, sh rub layer and ground layer. Then there are the vegetation types like, stranglers, epiphytes, parasites and saprophytes. Emergents are trees that grow above the canopy layer of the forest.