The Tibetan blackbird (Turdus maximus) is a member of the thrush family Turdidae. It was formerly considered a subspecies of the common blackbird. It is found in the Himalayas from northern Pakistan to southeastern Tibet. It is strikingly different from the common blackbird, being relatively large at 23–28 centimetres (9.1–11.0 inches) length. It also differs from the common blackbird by its complete lack of eye-ring and reduced song.[2]

References
BirdLife International. 2016. Turdus maximus. The IUCN Red List of Threatened Species 2016: e.T103892028A104360096. https://dx.doi.org/10.2305/IUCN.UK.2016-3.RLTS.T103892028A104360096.en . Downloaded on 28 December 2017
Collar, N. J. (2005). Tibetan Blackbird (Turdus maximus). p. 646 in: del Hoyo, J., Elliott, A., & Christie, D. A. eds. (2005) Handbook of the Birds of the World. Vol. 10. Cuckoo-shrikes to Thrushes. Lynx Edicions, Barcelona. ISBN 84-87334-72-5