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To assess correlates of the timing of cranial
pneumatization in wintering White-throated Sparrows
(Zonotrichia albicollis), we repeatedly determined
the stage of pneumatization of marked individuals in the
field following autumnal migration. There were
pronounced differnces
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among individuals and among years in the timing of cranial
pneumatization. Pneumatization occurred later in larger
individuals, as indicated by wing length, but the timing of
pneumatization was not related to dates of arrival in wintering
areas nor to social dominance.
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