It then fades to a paler pink, and the tip of the bill becomes blackish. The chest is often bare and there can be a white tuft on the head. The irises are brown. The exposed skin is pinkish initially, apart from the tip of the bill which is dark gray, but turns gray within a few days of hatching. The gray to sandy gray brown juvenile plumage appears between weeks two and six, and face and bill become pink a few weeks later, while the legs remain gray. The irises have turned slate-gray by this stage.
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Sex-related mortality of white ibis Eudocimus albus nestlings during a starvation event. Aguilera, E. Ramo, B. Food habits of the scarlet and white ibis in the Orinoco Plains. The Condor, Audubon, J. Edinburgh, Scotland: A. Bildstein, K. Energetic consequences of sexual size dimorphism in white ibises Eudocimus albus. The Auk, Post, J. Johnston, P. Freshwater wetlands, rainfall, and the breeding ecology of white ibises in coastal South Carolina.
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Atlantic coast, from the Carolinas south to Florida and thence west along the Gulf Coast, through the Caribbean to northern South America, and along the Pacific coast from Mexico to Peru Eudocimus ruber Atlantic coast of South America from southeast Brazil to Colombia, as well as inland in the Orinoco basin, and the islands of the Netherlands Antilles, and Trinidad and Tobago The two species hybridise, and are sometimes considered conspecific. The genus Eudocimus appears to be most closely related to but more primitive than Plegadis , the latter distinguished anatomically by the conformation of the tarsometatarsus. The fossil record is poor, but the Early Miocene fossil species Plegadis paganus has some intermediate features. The derived nature of this species indicates ibises belonging to Eudocimus were already in existence at this time.
American white ibis