Slaty-backed Gull, Larus schistisagus, Ring-billed Gull, Larus delawarensis, at Inglewood Bird Sanctuary, Calgary AB

	*Slaty-backed Gull Larus schistisagus* Stejneger**
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	*Slaty-backed Gull with Ring-billed Gulls Larus delawarensis* at Inglewood Bird Sanctuary, Calgary AB - November 12, 2006. © Robert Worona.**
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