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In page Red-winged blackbird:

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The calls of the red-winged blackbird are a throaty check and a high slurred whistle, terrr-eeee. The male's song, accompanied by a display of his red shoulder patches, is a scratchy oak-a-lee,[1] except that in many western birds, including bicolored blackbirds, it is ooPREEEEEom.[2] The female also sings, typically a scolding chatter chit chit chit chit chit chit cheer teer teer teerr.[3]