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Copyright of Journal of Raptor Research is the property of Raptor Research Foundation and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The article focuses on a study that compares morphological data on breeding Cooper's Hawks caught in southern Vancouver Island, British Columbia, central and southeastern Wisconsin, and northwestern and north-central North Dakota from 1999 to 2003. It measures the woodland hawks' body mass, tail length, wing chord, hallux length, and culmen length. Results show differences in breeding Cooper's Hawks' body mass and body structure. It adds that geographic segregation affect regional variations.

The article presents an update on a study about polygyny in Cooper's Hawks in Grand Forks, North Dakota. Topics covered include genetic confirmation of paternity of a male Cooper's Hawk in successful polygyny in a high density population in Grand Forks, nesting area of the breeding birds and significance of the findings to the biology of avian mating systems.

Trichomoniasis is a digestive tract disease caused by ingestion of the protozoan Trichomonas gallinae. This disease can be a significant source of mortality. No deaths of nestlings could be attributed to trichomoniasis in Cooper's Hawks (Accipiter cooperii) breeding in urban and rural environs in Wisconsin. North Dakota. and British Columbia. We detected T. gallinae in four (5.2%) of 77 nestling Cooper's Hawks during 2006 and 2007 among 42 urban nests on new study areas in southeast Wisconsin and eastern North Dakota/western Minnesota. All four infected young fledged, We did not detect T. gallinae in 52 breeding adult Cooper's Hawks on two urban study sites, nor in 28 migrant hatching year (n = 24) and adult (n = 4) Cooper's Hawks at Hawk Ridge Bird Observatory. Duluth, Minnesota in 2006-2007. Overall, we detected T. gallinae in only 2.5% of 157 Cooper's Hawks in northcentral North America. These results suggest a low prevalence of T. gallinae in Cooper's Hawks in the northern part of this hawk's breeding range. [ABSTRACT FROM AUTHOR]