Balance. A long tail would help counteract that, but would probably make it harder to fly.

You lean forward when you walk and run. Allowing gravity to affect momentum your shifted body mass makes it easier to move. Your muscles to less work.

Try standing completely upright or lean back slightly. Pick up one foot, straight up. No place it forward 18 inches and try to walk forward without leaning.

Takes a lot of muscle to move your mass.

Now...repeat, but lean forward a few inches. Your body wants to take off by itself.
Source(s):
training for hurdles

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