Sri Lanka is the country with the highest species richness in the world and home to several forest ecoregions, whose flora and fauna is related to that of southern India. The southwest portion of the island, where the influence of the moisture-bearing southwest monsoon is strongest, is home to the Sri Lanka lowland rain forests. At higher elevations they transition to the Sri Lanka montane rain forests. Both these tropical moist forest ecoregions bear strong affinities to those of India's Western Ghats. The northern and eastern portions of the island are considerably drier, lying in the rain shadow of the central highlands.The Sri Lanka dry-zone dry evergreen forests are a tropical dry broadleaf forest ecoregion, which, like the neighboring East Deccan dry evergreen forests of India's Coromandel Coast, is characterized by evergreen trees, rather than the dry-season deciduous trees that predominate in most other tropical dry broadleaf forests. These forests have been largely cleared for agriculture, timber or grazing, and many of the dry evergreen forests have been degraded to thorn scrub, savanna, or thickets. Several preserves have been established to protect some of Sri Lanka's remaining natural areas. The island has three biosphere reserves, Hurulu (established 1977), Sinharaja (established 1978), and Kanneliya-Dediyagala-Nakiyadeniya (KDN) (established 2004). Sri Lanka is a centre of bird endemism.