Smallest bird on earth
Hummingbirds are fascinating birds that are always fun to watch. These birds are able to hover in mid-air, dart from side to side, go straight up or down, or even backwards. They can out-fly and out-maneuver birds hundreds of times their size. There are many factors that contribute to the hummingbirds' ability to fly so easily through the air.
A hummingbird's wings are shaped so that they are slightly rounded on the top. "Their wings flaps 15-80 times per second, depending on the type of species they are. The Giant Hummingbird's wings beat 8-10 beats per second, the wings of medium size hummingbirds beat 20-25 beats per second and the smallest beat 70 beats per second."< http://en.wikipedia.org/wiki/Hummingbirds>. Bernoulli's principle explains why this helps the hummingbird has the ability to fly deliberately backwards or vertically, and to maintain position while drinking from flower blossoms. "They can fly more than five hundred miles without pausing to rest." Doyle, Brian. "Joyas Voladoras." The Best American Essay. ED Susan Orlean. Boston: Houghton Miflin 2005. 161-180. The air passing over the top of the wing must travel further than the air going under the wing. As the hummingbird moves forward, the velocity of the fluid increases over the wing and the pressure above the wing is reduced. The higher end under the hummingbird's wing provides lift for the bird. Hummingbirds have unusually strong muscles that enable them to raise and lower their wings with great power. As the hummingbirds thrust their wings up and down, they fly into the air with amazing agility and speed. The sleek outline of the bird and smooth feathers create little drag as the bird darts through the air. Thus, it will be to no surprise if we ever saw Hummingbirds flying upside down.
Another factor that helps explain how hummingbirds fly is called Archimedes's Principle. In his principle, hummingbird stays in the air at a high altitude because it...