Helping at a Cooper's Hawk Nest

Clint W. Boal; Rick L. Spaulding

doi:10.1676/0043-5643(2000)112[0275:HAACSH]2.0.CO;2

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Clint W. Boal,^*,**,*** Rick L. Spaulding^*,****

^*School of Renewable Natural Resources, Univ. of Arizona, Tucson, AZ 85721.
^**Present address: Minnesota Cooperative Fish and Wildlife Research Unit, 200 Hodson Hall, 1980 Folwell Avenue, St. Paul, MN 55108.
^***Corresponding author; cwb@fw.umn.edu
^****Present address: TEC, 1111 Chapala St., Suite 100, Santa Barbara, CA 93101.

Abstract

Nest helping has not been reported previously among Cooper's Hawks (Accipiter cooperii). We report a nesting attempt involving three Cooper's Hawks. An adult and subadult male made prey deliveries to an adult female and all three hawks engaged in nest defense. No evidence of intraspecific aggression was observed among the three hawks.

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Clint W. Boal and Rick L. Spaulding "Helping at a Cooper's Hawk Nest," The Wilson Bulletin 112(2), 275-277, (1 June 2000). https://doi.org/10.1676/0043-5643(2000)112[0275:HAACSH]2.0.CO;2

Received: 8 September 1999; Accepted: 1 December 1999; Published: 1 June 2000

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