Shooting clay pigeons is a popular U.S. sport, appealing to everyone from President Obama on down. In Pennsylvania, the thrill of shooting flying clay out of the air isn't enough for everyone. Some gun clubs have organized pigeon shoots, where live pigeons are used instead of clay targets. It's legal there, but controversial. Showing Animals Respect and Kindness (SHARK), an animal advocay group in Pennsylvania, is now using drones to catch pigeon killers.