So the thing about this ive thought about it before and i finally wanna suggest it,
I want to suggest there are wild cubic animals in mines that support them that if you are close enough or trap them in a area pick them up using the grab/pick up tool aka the hand or maybe a added item like the ghosts had.
Animals And Their Realms,
So I have some animals that i can link to realms and ill tell you the ones Ive thought of,
Wolves in forest or artic mines,bunnies in the same as wolves,maybe some fish in tropical mines and stuff like that. If you have suggestions,agree,or want to tell me if it wont work and how please tell me.