Attributes / relations provided by
♦ ¹del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.
♦ ²Optimal foraging of a herbivorous lizard, the green iguana in a seasonal environment, Wouter D. van Marken Lichtenbelt, Oecologia (1993) 95: 246-256