We have lizards galore. I didn't realize they ate spiders. Actually, I never thought about a lizard's appetite. A black widow spider bit me on my left thumb some years back. I got immediate medical attention, and there were no lasting side effects. I sure did turn my thumb BLACK. Like someone said, I don't believe they would eat enough bees to harm the bee colony. Like Clint Eastwood said in the Outlaw Josey Well's "everything's gotta eat."