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.
♦ 2ALTERNATIVE FOODS OF A DIET SPECIALIST, THE SNAIL KITE, STEVEN R. BEISSINGER, The Auk 107: 327-333. April 1990