I bought all mine as large about two weeks ago. They have started to pupate so I am excited. I was originally going to just have a one bin set up but started having second thoughts. I was going to move the pupa into a separate bin so they wouldn't get eaten or so the beetles would anyone else when the hatch but I am still undecided on what I want to do...lol. But the funny thing was, was when I went to pick up a pupa with my tweezers the tail end part wiggled! I was totally not expecting that to happen...lol.