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Bird Checklists of the United States <br />Sherburne National Wildlife Refuge <br />Zimmerman, Minnesota <br />Solid lines indicate approximate taxonomic categories. <br />Sp - March-May <br />S - June-August <br />F - September-November <br />W - December-February <br />a - abundant: common species that is very numerous <br />c - common: certain to be seen in suitable habitat <br />u - uncommon: present but not certain to be seen <br />o - occasional: seen at intervals of 2 to 5 years <br />r - rare: seen less often than every five years <br />LOONS <br />Common Loon <br />GREBES <br />« i <br />Pied-billed Grebe <br />Horned Grebe <br />Red-necked Grebe <br />Eared Grebe <br />PELICANS. CORMORANTS <br />American White Pelican <br />Double-crested Cormorant <br />c c c <br />r - u <br />r - r <br />BITTERNS. HERONS