here is a funny story that happened to me a while back. Here is what happened. I knew that mealworms burrowed so i put one in a metal container with moist calci-sand so I can see what the burrows look like I put under my bed and forgot all about it for about a month and while i am cleaning under my bed I find the container closed without air or anything I open it not to find a worm or any tunnels but a beetle. so i go on the internet to find out what happened. and i feel stupid still to this day that nature took its course with me not nowing a thing about it