Abstract
The duration of postnuptial molt in the White-crowned Sparrows of the Pacific Seaboard (Zonotrichia leucophrys nuttalli and Z. l. pugetensis) decreases northward by an average of 2.6 days per degree of latitude between the southernmost (35.2°N, molt duration 83 days) and northernmost (48.9°N, 47 days) limits of the breeding range. Males begin molting earlier than females by as much as 2 weeks. For both sexes, the date on which molt begins is independent of latitude and is correlated with the end of nesting season.
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