The ruby-throated hummingbird is migratory, spending most of the winter in southern Mexico and Central America, as far south as extreme western Panama, the West Indies, and southern Florida. During migration, some birds embark on a nonstop 900-mile journey across the Gulf of Mexico and Caribbean from Panama to Gulf Coast. The bird breeds throughout the eastern United States, east of the 100th meridian, and in southern Canada, particularly Ontario, in eastern and mixed deciduous and broadleaved forest. In winter, it is seen mostly in Mexico and southern Florida.

Where do ruby throated hummingbirds go in the winter? Let's have some stream of consciousness first.
The relevant sentence in the passage is: The ruby-throated hummingbird is migratory, spending most of the winter in southern Mexico and Central America, as far south as extreme western Panama, the West Indies, and southern Florida. So, the answer is southern Mexico and Central America , as far south as extreme western Panama , the West Indies , and southern Florida.