According to the story, university researchers teamed up with National Geographic to build 60 tiny wearable "cat cameras," which were then placed on 60 housecats in the Athens, Georgia area. Each cat's activities were recorded for seven to 10 days. Each cat spent four to six hours a day outside, and boy did they make use of their free time. The results read like a cheap grindhouse slasher flick: Lizards, snakes and frogs made up 41 percent of the total kills, small mammals comprised 25 percent, insects and worms were 20 percent and birds totaled 12 percent of kitty prey. The cats brought home 25 percent of their kill, ate 30 percent, and left almost half of their victims where they killed them.