I have heard mixed reviews on whether guineas really do much to snakes, but i would guess lizards would be on the menu. Look on youtube there are a few videos of guineas just harassing snakes but not doing anything to them. Guineas are supposed to be second to none on ticks though!
Chris
I am a guinea person myself. I would say it depends on what bugs you are looking to control. My chickens seem to be better at catching flying bugs then my guineas, but my guineas do a lot more searching for bugs. I would say over all the guineas catch more bugs than my chickens, but the...