Bustards, including floricans and korhaans, are large, terrestrial birds living mainly in dry grassland areas and on the steppes of the Old World.
Currently, ornithologists recognize two subspecies of the Great Bustard (Otis tarda): the Eastern (dybowskii) and the Western (tarda) Great Bustard. The Eastern subspecies is restricted to Siberia, Mongolia and China where about 1,500 individuals live. The Western subspecies is more numerous – between 42,000 and 55,000 individuals – and ranges from Portugal to Xinjang (western China). Genetic analyses suggest that there might be a hybrid zone in Xinjang (Kessler et al, 2018).
Kessler, A.E., Santos, M.A., Flatz, R., Batbayar, N., Natsagdorj, T., Batsuuri, D., Bidashko, F.G., Galbadrakh, N., Goroshko, O., Khrokov, V.V., Unenbat, T., Vagner, I.I, Wang, M. & Smith, C.I. (2018) Mitochondrial Divergence between Western and Eastern Great Bustards: Implications for Conservation and Species Status. Journal of Heredity.