Out here in California, my free range Guineas do kill snakes, they shred the baby snakes (even play tug-o-war with em!) and they make snake sushi out of the adult snakes to the point that they do indeed kill them, or the snake crawls off and dies from all the holes that the Gang of Guineas have pecked into them. I've seen it, so has my neighbor down the road that also breeds and sells Guineas. The adult birds will circle the snake, surround it, scream bloody murder at it, and peck at it from every direction... the snake doesn't know who or what to strike at so it coils up and just hides it's head until it's either dead or has to slither off bleeding and mangled, lol. They always make a major commotion and my dogs start howling, so I always know when they're going after a snake. YEAH!!! GO GUINEAS GO!!!! (Sorry but I hate rattle snakes!!!!!!)