The upland buzzard breeds between April and August, with egg laying tending to occur in May.Chen, W., Jiang, L., You, Z., & Chen, M. (2015). Breeding biology of the upland buzzard (Buteo hemilasius) on the Tibetan Plateau. Journal of Raptor Research, 49(3), 320-324. Nests tend to be located on outcrops, crags and ledges of cliffs, usually in locations blocked from the elements by rocks or vegetation. Some nests additionally are placed on steep rocky slopes. The nest is constructed with sticks and well lined, often with wool, grass, dry dung and, perhaps detrimentally, human garbage.Ellis, D. H., & Lish, J. W. (1999). Trash-caused mortality in Mongolian raptors. Ambio, 28(6), 536-537. This species normally lays a clutch of 2 to 4 eggs and, if an entire clutch is lost, they are capable of laying a replacement clutch. In Mongolia, clutch sizes have been recorded exceptionally varying up to 8, with an average clutch size reported as 3.49. Incubation lasts 36 to 38 days, although previously reported at only about 30 days. The chicks bear greyish-brown down and develop fairly slowly, fledgling at around 45 days. In western and central Mongolia, brood size averaged 1.95. Commonly, two young often fledge from upland buzzard, though up to four fledglings have been recorded. Breeding success is known to be food based and higher sibling competition and perhaps siblicide have been reported in instances where stable prey such as voles decline in population.Yosef, R., Gombobaatar, S., & Bortolotti, G. R. (2013). Sibling competition induces stress independent of nutritional status in broods of Upland Buzzards. Journal of Raptor Research, 47(2), 127-132.
