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Red-shouldered Hawk (Buteo lineatus). Forests and woodlands.
Flying from a branch, a Red-shouldered Hawk forces air rearward on the downstroke. With air channeled rearward between the wings, the first wing strokes during an escape or an attack provide "jet-propulsion" with the compressed air forced rearward driving the forward motion of the bird. Both gravity and the Newtonian action of the jet of air creates a rapid forward and downward trajectory until the airspeed of the bird is sufficient for the wings to create lift.
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