"A bird's center of gravity is the balance point between its two wings and between its head and tail. If it were possible to perfectly support a bird right at its center of gravity without it squirming around, the bird wouldn't tip in any direction. To fly well, birds must have most of their weight in their center of gravity, and very little weight in front of or behind it." (from "How Birds Fly: An In-Depth Journey North Lesson," found on learner.org) |