Hey everyone, I bought 3 female feeder mice and 1 male from Petco yesterday. I'm curious if I'm witnessing normal mating behavior or not. Several times now I've seen the male chase a female around the cage and she just squeaks and tries to avoid him, only allowing him to mount her for like a second. Just now I did see the male chase a smaller female around and they ended up in the hide box, rustling and squeaking in there for a good moment so maybe they mated? Should my females be more receptive to the male or maybe they're not in heat/still need to get used to him? Also I don't see any blood or wounds on them so I don't think any serious fighting has taken place.

Here's some pictures of a couple of my mice and their home (I made a side window too). First picture is of my male. Do they look healthy and of breeding age to you guys? Thanks for reading, I would greatly appreciate any feedback.