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This brown woodpecker flashes bright colors under the wings and tail when it flies. The Northern Flicker's ringing calls and short bursts of drumming can be heard in spring throughout most of North America. Two very different-looking forms -- Yellow-shafted Flicker in the east and north, and Red-shafted Flicker in the west -- were once considered separate species. They interbreed wherever their ranges come in contact. On the western Great Plains, there is a broad zone where all the flickers are intergrades between Red-shafted and Yellow-shafted.