What is the primary region where the vast majority of the Ruby-throated Hummingbird eastern breeding population winters?

Answer

Mexico and Central America

The vast majority of the eastern breeding population travels south to winter in Mexico and Central America, specifically citing areas from southeastern Mexico down through Belize, Guatemala, Honduras, Nicaragua, Costa Rica, and Panama.

What is the primary region where the vast majority of the Ruby-throated Hummingbird eastern breeding population winters?
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