Attributes / relations provided by
♦ ¹ Steimle FW, Pikanowski RA, McMillan DG, Zetlin CA, Wilk SJ. 2000. Demersal Fish and American Lobster Diets in the Lower Hudson - Raritan Estuary. US Dep Commer, NOAA Tech Memo NMFS NE 161; 106 p.
♦ 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.