Panchatantra Donkey Leopard Skin

tale:panchatantra_donkey_leopard_skin

A washerman drapes his donkey in a leopard's skin and lets it graze by night in the fields, where farmers flee the supposed beast. All goes well until the donkey, hearing a she-donkey bray, brays in answer; the farmers know the voice, and beat it. Moral: the disguise is betrayed by the voice within. — Panchatantra (attrib. Vishnu Sharma)