Carlton House, Saskatchewan.
Until recently considered conspecific with C. ustulatus, but differs in its olive- vs russet-toned upperparts (1); slightly brighter, bolder markings on face and breast (1); slightly shorter tail (mean 70·1 mm vs 73 in males#R; allow 1); slightly longer wing (mean 100·9 vs 97·8 in males#R; allow 1); song without the 2–3 almost identical initial notes (2); and alarm call a “quit-BRRR” vs “wee-BRRR”, with shorter length of initial note and faster pace of trilled part (at least 1)#R; moreover, present species forms a narrow (66–97 km) hybrid zone with C. ustulatus#R, within which selection against offspring is moderately strong#R. Three subspecies recognized.
Food and feeding
Status and conservation
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