A few of the good ones for the study of Hummingbirds. Largest brain, relative to size, of all birds. Hummingbirds have proportionally the largest hearts of any living animal. Resting heartbeat is 480 beats per minute and can go as high as 1,260 per second when excited. Resting hummingbirds breathe 250 times a minute.
Hummingbird feathers have two different ways of producing color.
This reflective feature is what causes a hummer's gorget to glitter when you are looking at the bird headon and to become duller when seeing the same bird from another angle. Curiously, the pigment of hummingbird feathers does not include red or yellow. Male hummingbird behavior is every woman's worst nightmare. Mating last 3-5 seconds, then he disappears. The female finishes her nest, lays the eggs, and tends the young alone.