New species of bird discovered in Arunachal Pradesh


According to a 2004 estimate, India, with 1180 species of recorded birds is 9th in the list of countries with the most diverse avifauna. Well, it can now safely be said that this particular figure is history, thanks to the spectacular habitat that is Northeast India in general and Arunachal Pradesh in particular.

A new species of bird has been described from northeastern India and adjacent parts of China by a team of scientists from India, Sweden, China, the US and Russia. The bird, thanks to the preferred habitat, has been named Himalayan Forest Thrush. The scientific name, Zoothera salimalii, honours the great Indian ornithologist Dr Sálim Ali (1896–1987), in recognition of his huge contributions to the development of Indian ornithology and wildlife conservation.

Zoothera-salimalii1
Himalayan Forest Thrush, or the Zoothera salimalii. Image credit: Per Alstrom

This is the first Indian bird which has been named after Dr. Salim Ali. Dr. Per Alström and Shashank Dalvi first discovered the Himalayan Forest Thrush in May-June of 2009 while studying birds at high elevations of western Arunachal Pradesh. It was realised that what was considered a single species, the Plain-backed Thrush (Zoothera mollissima), was in fact two different species in northeastern India.

What first caught the attention of the scientists was the fact that the “Plain-backed Thrush” in the coniferous and mixed forest had a rather musical song, whereas individuals found in the same region, but on bare rocky habitats above the tree-line had a much harsher, scratchier, unmusical song.

Studies of museum specimens in 15 museums in 7 countries revealed consistent differences in plumage and structure between birds from these two populations. It was confirmed that the species breeding in the forests of the eastern Himalayas had no scientific name. They have therefore named this new species Himalayan Forest Thrush (Zoothera salimalii). The high-elevation “Plain-backed Thrush” is now renamed as Alpine Thrush while it retains the scientific name of Zoothera mollissima.

Zoothera-salimalii
Himalayan Forest Thrush in its natural habitat. Photo by Craig Brelsford

Further analyses of plumage, structure, song, DNA and ecology from throughout the range of the “Plain-backed Thrush” revealed that a third species was present in central China. While this population was already known, it was treated as a subspecies of “Plain-backed Thrush”. The scientists have instead called it Sichuan Forest Thrush. The song of the Sichuan Forest Thrush was found to be even more musical than the song of the Himalayan Forest Thrush.

DNA analyses suggested that these three species have been genetically separated for several million years. Genetic data from three old museum specimens indicated the presence of a fourth species from China that remains unnamed. Future field studies are required to confirm this.
The Himalayan Forest Thrush is locally common. It has been overlooked until now because of its close similarity in appearance to the Alpine Thrush.

New bird species are rarely discovered nowadays. Since 2000, an average of five new species per year have been discovered globally, most of which are from South America. The Himalayan Forest Thrush is only the fourth new bird species described from India since our independence in 1947.

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