Think about your family and the different months you were born in. The moon phases that decide which form will be taken are like the zodiac signs for each of our months. I'm not too sure how the moon phases work but thats the impression I get.
Thanks, interesting thing to think about... (by the way, all the 5 children of my family where born within the same 5 months (end October - mid March, in different years of course), but I don't know if there are months in which humans in general get more children...)
But then why are some more common then other? Theories:
- a mating season, like mentioned by Necro
- Khajiit consciously choose when to mate, so they have the sub-type of Khajiit that they want to have
- Infant death (not a pretty option but possible)
Do you have other theories? What do you think is most likely the case?