"The demon is a large burrowing mammal found everywhere in the world. Demons are regarded as one of the most misunderstood and unique sentient creatures on the planet, due to their unique looks and general secrecy. Though they can speak humanoid languages, they prefer to stay underground in their clans and generally consider above-ground affairs strange."

They're also mole-cat hybrids concept-wise. Because my imagination is fucking weird. I need to fix the face up a bit though.

I honestly don't know what the references were but I bet I'd recognize them. Basically some Google Images of pumas and moles.