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B. S. 16237 - Adult green-winged teal. A "flapper" that has shed the flight feathers and is unable to fly. Note the ingrowing quills on the wing. Mouth of Bear River, Utah. August 11, 1915.

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B.S 16238 - Adult green-winged teal. A "flapper" that has shed the flight feathers and is unable to fly. New quills still in the sheath, may be seen on the wing. Mouth of Bear River, Utah. August 11, 1915.