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1 January 2017 Influence of Poisoned Prey on Foraging Behavior of Ferruginous Hawks
Nimish B. Vyas, Frank Kuncir, Criss C. Clinton
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We recorded 19 visits by ferruginous hawks (Buteo regalis) over 6 d at two black–tailed prairie dog (Cynomys ludovicianus) subcolonies poisoned with the rodenticide Rozol® Prairie Dog Bait (0.005% chlorophacinone active ingredient) and at an adjacent untreated subcolony. Before Rozol® application ferruginous hawks foraged in the untreated and treated subcolonies but after Rozol® application predation by ferruginous hawks was only observed in the treated subcolonies. We suggest that ferruginous hawks' preference for hunting in the treated subcolonies after Rozol® application was influenced by the availability of easy-to-capture prey, presumably due to Rozol® poisoning. The energetically beneficial behavior of favoring substandard prey may increase raptor encounters with rodenticide exposed animals if prey vulnerability has resulted from poisoning.

Nimish B. Vyas, Frank Kuncir, and Criss C. Clinton "Influence of Poisoned Prey on Foraging Behavior of Ferruginous Hawks," The American Midland Naturalist 177(1), 75-83, (1 January 2017).
Received: 14 January 2016; Accepted: 1 July 2016; Published: 1 January 2017

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