Even though it's a small hummingbird, the Rufous is one of the feistiest in North America. The brilliant orange male and the green-and-orange female are relentless attackers at feeders, going after hummingbirds larger than themselves. The Rufous Hummingbird makes one of the longest migratory journeys of any bird in the world, as measured by body size. At just over 3 inches long, its roughly 3,900-mile movement (one-way) from Alaska to Mexico is equivalent to 78,470,000 body lengths.