The darker the color, the more favorable the climate conditions are for survival. The outlined areas represent approximate current range for each season. More on reading these maps.
It’s generally accepted that the Glossy Ibis came across the Atlantic on the easterly trade winds from Europe or Africa in fairly recent times, invading the Caribbean and then North America. Since landing in the New World, it has slowly spread north and west, displacing its cousin, the White-faced Ibis. Audubon’s climate model shows a continuing movement of suitable climate space for this species in North America, especially in the summer season, but of concern only 35% of the current summer range remains climate stable.
Are the projected range maps different from the range maps in field guides? Find the answer here.