That does seem like a good challenge. It also might be the immigration patterns of nichelings. Where they need to quickly gain a variety of genes in order to survive and to keep traveling.
Why do nichelings have so much variety in them? Some nichelings can even look like different species to each other. They have insect, feline, canine, equine, and amphibian features in their genes.
Do rabbils ever die on their own? I've never seen them die without a predator around. I've seen crabbits do so though. Then again I don't usually observe rabbils.
You know how every friendly bearyena are males? Maybe it's because only males come out of the den. So, rather than the bearyena moms, it'd be bearyena dads.
I'd be happy to add him, but unfortunately I can't view the file. Pngs and jpegs work the best for pictures. I'd also like a description of his personality.