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The Midwinter Bald Eagle Survey is a type of "convenience sampling". These data are records of golden eagles associated with routes used to survey for bald eagles. The location of the routes has emphasized river stretches and water bodies where bald eagles are known to occur. The routes are not representative of golden eagle habitat and reflect marginal golden eagle habitat at best. Golden eagle observations were recorded incidentally. These survey routes were not randomly selected. The routes are likely biased towards states and portions of states where organizations and individuals were committed to long-term, consistent data collection. Quality review of pre-2008 data is questionable and those data may contain errors.