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South Dakota Ornithologists Union South Dakota Ornithologists Union Founded in 1949 SDOU has been South Dakotas primary statewide organization to promote the study of wild birds to encourage ornithological research and to preserve the states avian records. Birders environmentallyconcerned individuals ornithologists and other natural scientists all contribute to these efforts. Lets Go Birding Christmas Bird Counts SDOU spring and fall meetings and local bird club outings provide an opportunity to bird with and learn from others. Check out the upcoming events on our calendar and make plans to attend.