Aerial (top) view of Barn Swallow’s bill“Hirundo horreorum. Barn Swallow. Bill of moderate size for this family, of the usual shape, with straight commissure; nostrils lateral overarched by a membranous scale.” Elliot Coues, 1884
Elliot Coues Key to North American Birds (Boston, MA: Estes and Lauriat, 1884)
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