Board Thread:Lore Discussion/@comment-11369883-20130628225519/@comment-6881629-20130629081658

Or they couldn't produce children at all. For a list of the type of kittys made from the diffrent moon cycles look though the Khajiit page here. As for why legend has it they were reshaped by Azura and she is the Daedric Princess of Dusk and Dawn (and that is why the moons rise and fall).