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1 September 2003 AGE AND SEX DIFFERENCES IN THE TIMING OF SPRING MIGRATION OF HAWKS AND FALCONS
HELMUT C. MUELLER, DANIEL D. BERGER, NANCY S. MUELLER
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Abstract

We trapped 994 hawks during spring migration in years between 1953 and 1972. We obtained sufficient numbers to comment on age or sex differences, or both, in the timing of migration of six species. Adults migrated earlier in most species, presumably because most adults but few juveniles breed. Adult male Sharp-shinned Hawks (Accipiter striatus) migrated significantly before adult females and the larger (presumably female) Red-tailed Hawks (Buteo jamaicensis) migrated significantly earlier than smaller individuals. Juvenile female Sharp-shinned Hawks and Cooper's Hawks (A. cooperii) migrated before males, probably because more juvenile females than males breed.

HELMUT C. MUELLER, DANIEL D. BERGER, and NANCY S. MUELLER "AGE AND SEX DIFFERENCES IN THE TIMING OF SPRING MIGRATION OF HAWKS AND FALCONS," The Wilson Bulletin 115(3), 321-324, (1 September 2003). https://doi.org/10.1676/03-011
Received: 14 January 2003; Accepted: 1 June 2003; Published: 1 September 2003
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