The official website of Sri Lanka's Ministry of Tourism, run by the Sri Lanka Tourism Development Authority (SLTDA) is a excellent source of information for travellers. The following quotation is from its page about Sri Lanka's wildlife:
Despite its small size Sri Lanka boasts of one of the highest rates of biological endemism in the world whether in plants or animals and is included among the top five biodiversity hotspots in the world. Of the ninety-one species of mammals found in Sri Lanka Asian elephants, sloth bear, leopards, sambar and wild buffaloes engages the majority of the attention of wildlife enthusiast. Yet the rarest mammals of Sri Lanka are the red slender Loris, Toque Macaque, and Purple-faced Langur, who according to IUCN clarifications are endangered due to habitat loss.
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