Quote Originally Posted by Sita View Post
They look big enough to be breeding, and that is normal mating behaviour you're witnessing. The male will only mount for a second, but they'll do that dozens of times when the female is receptive. Since you've actually seen it, expect babies in about 3 weeks! Do still keep an eye out for wounds though.
Awesome, thank you! I'm very excited, this is turning out to be a fun little project. If/when I have a successful litter or two, I plan on getting another colony started.

Unfortunately I have to move the mice outside to my garage as the smell is irritating to my family, even though the cage is clean and there's good ventilation.

I am curious if the mice will survive and breed out there come summer time.

I live in inland Southern California at a moderate elevation and the highs average about 95 degrees F during the summer. It's not a humid heat though and it cools off at night to the 50's and low 60's with a nice westerly (ocean) breeze in the evening.

If I keep them in the garage out of direct sunlight and keep the main garage door open along with the side door, in addition to keeping a fan on them and adding ice to their water bottles, will they survive and breed through the summer?