Attributes / relations provided by
♦ 1Ravokatra, M., Wilmé, L. & Goodman, SM (2003). Bird weights. In The natural
history of Madagascar: 1059–1063. Goodman, SM & Benstead, JP (Eds). Chicago: The University of Chicago Press
♦ 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
♦ 3Jetz W, Sekercioglu CH, Böhning-Gaese K (2008)
The Worldwide Variation in Avian Clutch Size across Species and Space PLoS Biol 6(12): e303. doi:10.1371/journal.pbio.0060303