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I had female and male gerbils as a kid but my parents made me keep them in separate cages so they wouldn't reproduce. The females all mated with each other as did the males, and so my ten year old mind immediately believed that they would also mate with the opposite gendered gerbils. I started letting them live together since I wanted even more gerbils and no one noticed, but they would not mate, despite living together for a year before most of them died. I have read gerbils have a "mate for life" but I'm not sure as I'm pretty sure I recall the females all mating with each other and the males all mating with each other, not this female has that female and this male has that male.
Why is that?
Gerbils in the picture aren't mine.