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Interspecific Killing of Vulpes vulpes (Red Fox) Kits at a Den Site by Canis lupus (Gray Wolf) in Isle Royale National Park, Michigan

Tyler R. Petroelje1,*, Nicholas L. Fowler1, Elizabeth K. Orning1,2, Brent R. Patterson3, Mark C. Romanski4, and Jerrold L. Belant1

1Global Wildlife Conservation Center, State University of New York, College of Environmental Science and Forestry, 1 Forestry Drive, Syracuse, NY 13210. 2Current address - US Geological Survey, Fort Collins Science Center, 2150 Centre Avenue, Building C, Fort Collins, CO 80526-8118.3Wildlife Research and Monitoring Section, Ontario Ministry of Natural Resources and Forestry, Peterborough, ON K9L 1Z8, Canada. 4US Department of the Interior, National Park Service, Isle Royale National Park, Houghton, MI 49931. *Corresponding author.

Northeastern Naturalist, Volume 29, Issue 1 (2022): N18–N26

Abstract
Canis lupus (Gray Wolf or Wolf) have killed subordinate canids that scavenge on Wolf-killed prey, but little evidence is available for antagonistic behavior of Wolves toward other canids at interspecific den sites. We investigated clusters of locations from a global positioning system (GPS)-collared male Wolf, translocated to Isle Royale National Park, MI, on 23 March 2019. On 17 May 2019, we investigated a GPS cluster of the Wolf and observed 3 Vulpes vulpes (Red Fox) kit carcasses at an excavated Red Fox den site. We report details from this event and evidence for interspecific aggression and implications for Wolf–Red Fox interactions. To our knowledge, this represents the first reported killing of Red Fox kits at their den by a Wolf. Limited reports of interspecific killings by Wolves of Red Foxes suggests this interaction was opportunistic and rares.

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