Attributes / relations provided by
♦ 1Morphological Characters of Bird Species in Taiwan, Hau-Jie Shiu, Tzung-Su Ding, Jia-En Sheu, Ruey-Shing Lin, Chau-Nien Koh, and Pei-Fen Lee, Taiwania, 50(2): 80-92, 2005
♦ 2Hamish Wilman, Jonathan Belmaker, Jennifer Simpson, Carolina de la Rosa, Marcelo M. Rivadeneira, and Walter Jetz. 2014.
EltonTraits 1.0: Species-level foraging attributes of the world's birds and mammals. Ecology 95:2027
♦ 3del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.).
Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.