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Wilson's Storm-Petrel: Small storm-petrel, mostly brown-black body, pale brown wing bands, large, conspicuous white rump. Wings are short and rounded. Feet extend past tail in flight. Smallest and most commonly seen storm-petrel off the Atlantic Coast. Direct flight with steady, shallow wing beats.
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Leach's Storm-Petrel: Medium storm-petrel with dark brown body and white rump and undertail feathers. Wings are dark with pale gray-brown bar on upperwings. Long tail is dark and forked. Bill, legs, and feet are black. Its flight is bounding and erratic, with frequent changes of direction and speed.
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