User blog comment:Lord Loss/Monster Appreciation Week: Zinogre/@comment-5963861-20130610002331/@comment-5853890-20130611071611

The only wyvern traits it has is having 4 limbs similar to tiggy/narge/etc. Perhaps the wing finally devolved into limbs which lead to the animal being fully ground base and having to adapt to a new environment thus changing from scales to fur. Just my 2 cents.