Article Abstract:
The effects of suboptimal, tall-grass substrate on the hunting performance of Loggerhead Shrikes were investigated. Activity-budgets of shrikes on six territories dominated by dog fennel were compiled before and after the territories are mown. The data recorded includes the birds' hunting attempts per hour, hunting efficiency and composition of diet. Results revealed that theshrikes altered their hunting behavior after the territories were mown. However, none of the shrikes adjusted the boundaries of their territories.
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Article Abstract:
The mode of prey transport by Loggerhead Shrikes wss studied with respect to prey body mass. Twenty-three individual shrikes laboratory mice withmasses ranging from 9.0 to 61.9 grams were used as preys. The distances flown by the shrikes while carrying their respective preys were measured using optical range finders. The results agreed with the modes of transport previously reported for free-ranging Loggerhead Shrikes.
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Article Abstract:
Sex-biased, breeding site fidelity wasinvestigated in a population of northern shrikes over three breeding seasons. Males were found to be highly territorial, remaining year round, while females stayed only for the breeding season. Nests were built in the same supportive structures in subsequent breeding seasons, indicating that the nesting sites were chosen by the males who then led the females to these sites.
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