I got my Guineas for bug patrol, knowing they would also make a racket when spotting a predator or something different. So far mine will sound off the alarm call if they see a cat, fox, dog, or hear a tractor startup in the distance, cloud moves over the sun, wind blows a blade of grass, or they see me with a bucket whether it has scratch in it or not. Sometimes when a strange car pulls up and/or the normal car they see every day pulls up. An owl hoots, a hawk flies over (or a robin). Strangely enough, they didn't sound off when the wild Turkeys came up to see what all the fuss was about.