The hummingbird brings a whole new meaning to the word "unique." Boasting the smallest bird in the world, this family ranges in size from the two inch long bumblebee hummingbird to the giant hummingbird, which reaches a length of eight inches. The hummer's metabolism is as powerful as the engine of a high-performance race car, its heart pumping at a stunning 1,260 beats per minute to maintain a steamy body temperature of 105 degrees F. Its mighty...