Avian predators hunting birds near windows. Proceedings of the Pennsylvania Academy of Science 55: 90-92. Daniel Klem, Jr., 1981
ABSTRACT — Records of avian predators hunting in the vicinity of windows were obtained from 1974 to 1979. These data indicate that Accipiter hawks and Loggerhead Shrikes (Lanius ludovicionus) are capable of exploiting prey-catching opportunities in human modified environments by learning that prey are easily available near windows. The data further show that these predators kill themselves by flying into nearby windows while hunting. At least for accipiters and especially the Sharp-shinned Hawk (,4. striatus), the habit of hunting birds at feeding stations near windows may explain why these raptors become frequent windowkills.