They can actually fit through a doorframe, I have them fly through my outer door somewhat regularly, makes it easy to trap ones you like or don’t like to prevent mix ups when taming as you can use your base to trap the pester ones and kill them off easily as they tend to stick to walls or contents when inside. Or you can lure the one you like inside and kill the rest to use as bait to tame the one you want. Or you can let them in if you just like having them around I guess.