After one of my hives' being robbed, I closed the hive up for a couple of days, so any robbers still in the hive could be assimilated. I opened them up this morning, giving them only one bee space. There were robbers outside again, and it seemed that hive residents were letting bare bee butts inside the hive. Do bees that were being robbed also have bare butts? WILL the hive defend itself if they have ONE bee space?? Thank you.