Miyama stag

Donation in City Folk
Blathers will say this upon donation: "With its thick, bumpy, armorlike exoskeleton, the Miyama stag beetle is quite popular with children. However, the truth is, this beetle is fragile enough to perish from injuries we'd usually consider minor. Indeed, it appears this beetle suffers from a case of rather too much bark and too little bite."

Encyclopedia Information
In City Folk, the encyclopedia says: "Known for the distinct shape of their heads, they look srong but are delicate."