Attributes / relations provided by 
♦ 1Kattge, J. et al. (2011b) 
TRY - a global database of plant traits Global Change Biology 17:2905-2935
♦ 2USDA Plants Database, U. S. Department of Agriculture
♦ 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.
♦ 4Ben-Dov, Y., Miller, D.R. & Gibson, G.A.P. 
ScaleNet 4 November 2009
♦ 5Jorrit H. Poelen, James D. Simons and Chris J. Mungall. (2014). 
Global Biotic Interactions: An open infrastructure to share and analyze species-interaction datasets. Ecological Informatics.