For the last couple of weeks, I have gotten up in the morning to find that something is eating my cactus plant, which is out on our deck for the summer. I can't say it is eating it, but it is nipping off all the branches and there was a large pile of them yesterday morning. I moved the plant away from the bannister and just found a few braches on the floor this morning. Can you tell me what is going on? Almost all of the plant is trimmed down. Our deck is covered by an awning.