The more I learn about ruby-throated hummingbirds, the less I understand. Unlike western hummingbirds, ruby-throats are not well adapted to freezing temperatures, which occur at elevation even in mid-summer. Ruby-throated hummingbirds have the fewest feathers of any bird, about 940. Ruby-throated hummingbirds are the most widespread hummingbird species in the world, enjoying a range that extends from Texas to Labrador and everything in between. Over the past quarter-century, some ruby-throated hummingbirds have not bothered to cross the ocean at all.