Observations details for species Ring-billed Gull Larus delawarensis for Owen county
National Audubon Society. 2008. The Christmas Bird Count Historical Results 1992-2007, obtained from National Audubon Society. Please refer to the National Audubon Society for details of this observation; www.audubon.org, www.audubon.org/bird/cbc. New York, New York.