Yeah, be careful - I had one plant that mysteriously died overnight - when I investigated, the stem had been snapped below the dirt at the base. I'm sure a big frog or toad had gotten in there and tried to dig in for a cool place to hang out (it's HOT here and the potted plants are the only thing getting regular water). I've seen both big frogs and toads - here's one in a plant that had broken that I was trying to root. A good thing to do is to give them alternatives - a toad house; can be a broken pot that acts like a little cave - whatever will give them a little escape from the heat. Google image toad house and you'll see.