As stated above, in most stories Yukkunaes are only born (in the wild at least) when Yukkuri Kanakos and Suwakos mate with each other. Typically the Suwakkuri will lay an unusually large egg, perfectly round and about the size of a softball, which will hatch within a week, revealing a newborn Koyukkuri Sanae. When born via the normal method of reproduction, it follows the normal procedure. In return, Yukkunaes are only able to reproduce Yukkuri Kanakos and Suwakos, not simply giving birth to those types of yukkuri themselves, but also causing their mates to give birth to those types of yukkuri as well. This often leads to misunderstandings, and hurt feelings when Yukkunaes mate with yukkuris other than the same types they were born from (Typically these are Reimus, but others have occurred