The calliope hummingbird is the smallest bird species in North America and measures just 3 inches long.This is one factor that makes identifying hummingbirds very challenging. Many hummingbird species, including Anna’s, Black-chinned, Allen’s, Costa’s, rufous, calliope, and broad-tailed hummingbirds, can breed together to create hybrid species.They are found in Central and South America as well as throughout the Caribbean. The rest of the hummingbirds are primarily tropical species and do not regularly migrate. Only 17 species regularly breed in the United States, and nine species may visit the country or be reported as regular vagrants. ![]() There are more than 300 unique hummingbird species in the world.A hummingbird egg is smaller than a jelly bean! Their eggs measure less than 1/2 inch long but may represent as much as 10 percent of the mother’s weight at the time the eggs are laid. Hummingbirds lay the smallest eggs of all birds.Hummingbirds have no sense of smell but have very keen eyesight.In comparison, a human's average heart rate is only 60 to 100 beats per minute at rest. ![]()
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