Collister and Wicklum (1996) found that the distal extent of white color on the primary flight feathers, tail length, and bill depth contributed the most to discrimination between sexes in their sample of loggerhead shrikes on the Canadian prairies.
We found that both methods substantially improved predictive models for identifying sex in our California sample of loggerhead shrikes, for which sex was determined by DNA.
For example, there was no significant (univariate) difference in tail length between sexes in our sample, despite Santolo's (2013) finding that males in his California sample of loggerhead shrikes had significantly longer tails than did females.
For example, my studies compared favorably with studies in Virginia, Minnesota and Ontario, and showed that in northeastern North America the loggerhead shrike prefers to nest in isolated shrubs or hedgerows associated with grazed pastures and nearby hayfields as opposed to agricultural lands dominated by row crops such as corn.
The record of loggerhead shrike populations in New York, and most of the northeast, clearly shows a species that expanded its range and prospered with the settlement of the state and the clearing of wooded land for agriculture.
Bird species known to cluster their territories include loggerhead shrike
(Lanius ludovicianus), house wren (Troglodytes aedon), acorn woodpecker (Melanerpes formicivorus), and least flycatcher (Empidonax minimus) (Burgess et al.
Fish and Wildlife Service for financial support and the Indiana University Department of Biology, particularly my advisor, Donald Whitehead, for technical and logistical support of my study of Indiana's loggerhead shrikes. Reuven Yosef and three anonymous reviewers suggested modifications to earlier versions of the manuscript.
Possible ecological role of food caches of loggerhead shrikes. Auk, 94:391-392.
None of the variables measured were significantly related to nesting success of loggerhead shrikes. Shrikes had high nesting success on the study area.
Breeding ecology and site fidelity of American robins, brown thrashers, and loggerhead shrikes in shelterbelts in North Dakota.
We detected three NNLP Tier I grassland bird species at study sites within the Southeast prairies BUL (loggerhead shrike
, Bell's vireo, and Henslow's sparrow) but these species were not detected at study sites within the Sandstone Prairies BUL.
Take the loggerhead shrike
, a gray-and-black bird the size of a stocky starl- ing, with a stout, downcurved beak.