Despite its dramatic-sounding conclusions, UK research into the “sub-lethal effects” of cats reveals very little about real-world predator-prey dynamics or their potential impact on bird populations.

Common blackbird. Photo courtesy of Wikimedia Commons and Andreas Trepte.

“A new study from British scientists has documented for the first time, significant new impacts to birds from outdoor cats,” announced an April 18 news release from the American Bird Conservancy, “reporting that even brief appearances of cats near avian nest sites leads to at least a doubling in lethal nest predation of eggs and young birds by third-party animals.” The study, by PhD student Colin Bonnington, Kevin J. Gaston, professor of biodiversity and conservation at the University of Exeter, and Karl L. Evans, conservation biology lecturer at the University of Sheffield (and Bonnington’s PhD advisor), was published earlier this year in the Journal of Applied Ecology as “Fearing the feline: domestic cats reduce avian fecundity through trait-mediated indirect effects that increase nest predation by other species.” Read more