The article offers information on horned grebe and eared grebe in Colorado. It cites that the horned and eared grebes mostly appear during spring and fall. It states that the numbers of migrant horned grebe at the state falls when the number of eared grebe migrants is increasing. It notes that adult horned grebes performs their molt outside their breeding grounds. It explains that eared grebe has narrower head than horned grebe and the latter has pale trip to its bill.