Publication Type: | Journal Article |
Year of Publication: | 1991 |
Authors: | Rosenfield, RN, Bielefeldt, J |
Journal: | The Condor |
Volume: | 93 |
Issue: | 3 |
Date Published: | 1991 |
ISBN Number: | 00105422 |
Keywords: | Accipiter, Accipiter cooperii, Accipitridae, Astur, Astur cooperii |
Abstract: | From 1986 to 1990 we studied the vocalizations of 10 mated pairs of Cooper's Hawks (Accipiter cooperii) during the pre-incubation stage. We heard four different vocalizations during nest-building, copulatory, and other pre-laying activities. There was a marked asymmetry in vocalizations between the sexes during the pre-incubation period. Compared to males, female Cooper's Hawks (1) had a larger repertoire of calls, (2) called more frequently, and (3) called during a wider array of activities. We suggest that the various calls signal presence, identity, location, dominance, and non-aggressive motivation. We attribute some of the intersexual differences in pre-incubation vocalizations to the pronounced degree of reversed sexual size dimorphism in this species. |
URL: | http://www.jstor.org/stable/1368197 |
Short Title: | The Condor |
Taxonomic name: