I read that putting the legs of the hive stand in little cups of motor oil keeps unwanted crawling preditors, such as insects and mice, out of the hive. I though I'd give it a try. After a number of days, I noticed a build-up of dead bees in the oil. In taking their dead sisters out of the hive, can the bees be putting their dead sisters in the oil, or are my good, healthy bees unwittingly committing suicide by landing on the oil? The oil suggestion came from a reputable source, but I'm beginning to wonder. Any responses or suggestions would help.