I've got a large colony style cage I built out of an old trampoline. One of my does just kindled, like 30 minutes ago. She built her nest under one of the crates I have in there for extra shelter, so I think the babies are safe from traffic. They have a large hutch they generally gather together in. The crates are in there so when they're moving around they still have places to duck under if/when they're feeling threatened. Anyways, there are two other females in with her, one who is very gentle, the other one is a bit more aggressive, she keeps mounting my new mom. Is this normal behavior or a sign that I should probably separate her like I did my males?