This just happened to me. Two days ago one squirrel and today another. This time it was still alive but no real movement...just twitching. I feel horrible for these little things. Looks like something is attacking the nervous system, broken neck, but no wounds. Weird part is that it is in the same spot. Unless I have a venomous snake that they are going to in my palm tree (it was found under it). Or they are just falling and breaking their necks, but two in almost the same exact spot? Dunno but I will contact the humane society thanks to the suggestions here.