There are several reasons I can think of, but as I find your question a bit vague, I don't know if any of this applies to your mice. The first and most obvious thing is to make sure that you have one mouse of each gender. The male's testicles are clearly visible under its tail, while the female of course has nothing sticking out under hers. The second thing to consider is the age of your mice. They could simply be too young to mate. Female mice are sexually mature at 6 weeks, and males at around 8 weeks. Also if you just recently introduced your mice, they'll need some time to get used to each other. It's also possible that she's pregnant and you don't know it yet. The gestation period of a mouse is between 17 and 21 days. Normally your female will show a week before she gives birth, but you can't always tell that she is pregnant. I have a female that gave birth to a single baby as it was her first litter and I couldn't tell at all that she was expecting.
372?
yes all mice mate
No
not literally
Yes, they could. But they like to mate with their own kind. But some mice will do it. Mice are big on breeding. They will most likey do what ever it takes to mate with a female mouse. Have you ever saw houses invated by mice? If you have, there are HUNDREDS, maybe even THOUSANDS invading that house! But your pet mouse won't be mated because she will be in a safe place (in her cage/aquariam).
no they cant
you cant
i think that a flamingo and a bird cant mate
ok yes they can unless they are a chaos chao. they are incapeable of mating. as long as the chao is a REAL non imortal chao then they will mate (tails chao= cant mate knux chao= cant mate Amy chao=cant mate!) these are nearly inpossible if they are imortal
only if the "other animal" is tiny just like it and wants to also mate with them.
no they cant
there is no animal with 6 eyes and cant see but...3 blind mice can see,2 + 2 + 2 = 6 and there blind so its three blind mice