Attributes / relations provided by
♦ ¹Consumption of Aquatic Plants by the West Indian Manatee, Kay Etheridge, G. B. Rathbun, J. A. Powell, and H. I. Kochman, J. Aquat. Plant Manage. 23: 21-25 (1985)
♦ 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.