Members of the genus Spilornis are mostly rather large hawks, ranging to rather small. Essentially there is only one widespread form from India to Celebes and the Philippines, with many well-marked island forms. Only on the Andaman Islands has there been a `double invasion’ with two spccies co-existing, and even they appear to be separated ecologically with one living inland and the other in the mangrove swamps. The Celebes and Philippine forms are recognised as distinct; as are some of the dwarf races of the Nicobars and Sumatran Islands.
notion that it is distinct from Crested Serpent-eagle Spilornis cheela
Listen to the sound of Mountain Serpent Eagle
[audio:http://www.planetofbirds.com/MASTER/ACCIPITRIFORMES/Accipitridae/sounds/Mountain Serpent Eagle.mp3]
Copyright remark: Most sounds derived from xeno-canto
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Habitat loss, degradation and fragmentation is the primary threat to the species towards the lower limits of its distribution, where the extent of forest is diminishing fairly rapidly in the face of agricultural expansion and intensification.