Hummingbirds' wings 'buzz' or make a whirring sound while the birds are in flight. Birds frequently vocalize to attract a mate. Hummingbird gorgets Gorgets are composed of flat iridescent feathers that flash bright colors when sunlight is reflected at certain angles. Because hummingbirds don't really sing, males will use their gorgets in breeding displays. They also use their gorgets as a threat to territory intruders.
Gorgets also help identify the various species of hummingbirds.
There are about 16 species of hummingbirds in the U.S. and Canada. The eastern U.S. has only the Ruby-throated hummingbird, with the southeastern states sighting more types of hummingbirds on a regular basis. The southeastern states are starting to see more species over wintering. Rufous Hummingbirds have been sited in some midwestern states during the last two years. Check with your local Wild Birds Unlimited store for birds that have been sighted in your area.