The cocked tail and rusty undertail coverts help distinguish this bird from the similar Indian Chat (Cercomela fusca). This is a female. Males are black below with a blue sheen. Five subspecies are recognized. This is the northern C. f. cambaiensis in which the males are brown backed and females are relatively pale. Robins in the subfamily Saxicolinae (Old World Chats) were formerly classified as members of the Thrush family (Turdidae), but as first proposed by Sibley and Monroe are now usually recognized as members of the Old World Flycatchers (Muscicapidae). This species was formerly in the monotypic genus Saxicoloides but recently merged in the genus Copsychus with the Magpie-Robins by both Clements/eBird and IOC. This change follows a recommendation by Sangster et al. (Mol. Phyl. Evol. 57:380-392, 2010). Digiscoped with Panasonic DMC-LX5 | Nikon FieldScope III | 30XWA | hand-held (no adapter).
References:
Clement, P (2015) Robins and Chats. Helm.
Rasmussen, PC & Anderton, JC (2005). Birds of South Asia. The Ripley Guide. Washington DC and Barcelona: Smithsonian Institution and Lynx Edicions.