Endemism is the ecological and evolutionary phenomenon where a species or group of organisms is unique to a specific, restricted geographic area, like an island, mountain range, or country, and found nowhere else naturally. These endemic species evolve in isolation, adapting to their unique environments, making them crucial for biodiversity but also highly vulnerable to extinction from habitat loss, climate change, or invasive species.
Sri Lanka is a biodiversity hotspot with high rates of endemism, meaning many unique species are found nowhere else, including Birds, Mammals, Reptiles, Amphibians, Butterflies and Inland Aquatic Fish.
Sri Lanka has recorded nearly 500 Birds species, comprising approximately 236 resident species, over 200 migratory species and about 70 Vagrant species.
Sri Lanka supports a remarkably rich avifauna, including 35 endemic bird species and 72 endemic subspecies. With an overall species endemism of approximately 11%, this figure is notably high for an island of Sri Lanka’s relatively small geographic extent.
In addition to island endemics, 43 bird species recorded in Sri Lanka are considered endemic to the South Asian region. Among these, 38 species are resident, while five are winter migrants.
Renowned for its extraordinary biodiversity, Sri Lanka is home to 92 terrestrial mammals and 26 marine species. The island boasts 19 unique endemic species and 6 endemic subspecies, including the majestic Sri Lankan leopard, its apex predator. This rich wildlife heritage makes Sri Lanka a vital hotspot for conservation and a captivating destination for nature enthusiasts.
Sri Lankan Elephant
Elephas Maximus Maximus
Rusty-spotted Cat
Prionailurus rubiginosus
Sri Lankan Leopard
Panthera pardus kotiya
Grey Slender Loris
Loris lydekkerianus
Sloth Bear
Melursus ursinus
Wild Boar
Sus scrofa
Sri Lanka supports an exceptionally rich reptile fauna, including snakes, lizards, turtles and tortoises, geckos, skinks, monitor lizards, and crocodiles. Owing to its long geological isolation and diverse ecosystems, the island exhibits a remarkably high level of endemism, with over 60% of its reptile species found nowhere else in the world.
A total of 108 snake species have been recorded in Sri Lanka, of which 57 are endemic. The country is home to 22 species of lizards, with 19 species being endemic. Along the coastal regions, five species of marine turtles are recorded. Sri Lanka also supports two species of crocodiles.
In addition, four species of tortoises occur on land, one of which is endemic to the island. The herpetofauna further includes 51 species of geckos and 32 species of skinks, with approximately 90% of these species being endemic.
The Sri Lankan Green Pit Viper is perhaps the most iconic endemic serpent, known for its vibrant camouflage and triangular head.
Peltopelor trigonocephalusSri Lanka supports a rich and diverse butterfly fauna, with 248 recorded species distributed across the island’s varied climatic and ecological zones. Notably, 30 of these species are endemic, making Sri Lanka an important centre of butterfly endemism in the region.
Sri Lanka possesses an exceptionally rich and unique amphibian fauna, comprising 120 recorded species, of which 107 species are endemic to the island. This extraordinarily high level of endemism places Sri Lanka among the most important global hotspots for amphibian diversity and conservation.
The majority of Sri Lankan amphibians are frogs, belonging mainly to families such as Rhacophoridae, Dicroglossidae, and Microhylidae, with many species having highly restricted distributions. Most endemic species are closely associated with wet-zone lowland rainforests and the central highlands, where stable humidity, dense canopy cover, and clean freshwater habitats support their survival.
Amphibians in Sri Lanka play a crucial ecological role as predators of insects, including agricultural pests, and as bio-indicators, as their permeable skin and complex life cycles make them highly sensitive to environmental changes. However, habitat loss, deforestation, climate change, pollution, and the spread of disease have placed many species under severe threat, leading to high levels of endangerment.
The remarkable diversity and endemism of Sri Lanka’s amphibians underscore the island’s global conservation importance and highlight the urgent need for effective protection and sustainable management of its remaining natural habitats.
