10 of the World’s Smallest Birds

North America’s smallest bird is the calliope hummingbird, and their flight patterns take them all the way from Canada in the north to Mexico in the south. This elliptical migration pattern covers 5,000 miles — an especially impressive feat considering that these birds are only about 3 inches long. They typically fly low, keeping to flowers that would go unnoticed by larger and potentially aggressive hummingbird species.