Attributes / relations provided by
♦ ¹Importance of trophic information, simplification and aggregation error in ecosystem models, S. J. Metcalf, J. M. Dambacher, A. J. Hobday, J. M. Lyle, Mar Ecol Prog Ser 360: 25–36, 2008
♦ ²del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.