Paula White, a wildlife biologist, was examining lion skulls to estimate the animals' ages when she noticed something strange about their teeth. Instead of just showing the normal, gradual wear that happens over time, a sharp, V-shaped notch was cut into the back edge of some of the big cats' canines.
Researchers used photos of trophy-hunted lions and leopards especially of their teeth to do forensic work evaluating the effectiveness of conservation efforts in Zambia.