Researchers looked at nonmigratory cougars and the multiple species that migrate through their areas to see if they were targeting one species or multiple. Turns out that they target them all as they move through and find their target more as a target of opportunity vs following one species and trying to wipe them out. 

Elbroch, L.M. et al. (2013) ‘Seasonal foraging ecology of non-migratory cougars in a system with migrating prey’, PLoS ONE, 8(12). doi:10.1371/journal.pone.0083375.

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