Sources : Leucrota

Pliny the Elder [1st century CE] (Natural History, Book 8, 30): The leucrocota is the size of an ass, and has the neck, tail and breast of a lion, the haunches of a stag, cloven hooves, a badger's head, and a mouth that opens from ear to ear, with ridges of bone instead of teeth. It is the swiftest of wild animals, and is said to be able to imitate the human voice.

Gaius Julius Solinus [3rd century CE] (De mirabilibus mundi / Polyhistor, Chapter 27.26): In a part of Aethiopia, the hyena mates with lionesses. From these unions, monsters named “corocottae” are born. This creature also feigns the voices of men. It never moves the pupils of its orbs, but stares, gazing without blinking. It its mouth it has no gums, and one continual tooth. In order that this is never blunted, it is by nature closed up in a sort of casket. [Chapter 52.34] The leucocrota excels all beasts in speed. It is the size of a wild ass, and has the haunches of a stag. It has the breast and legs of a lion, the head of a badger, and cloven hooves. Its mouth gapes from ear to ear, and it has continual bone in place of teeth. This is its shape: in voice it imitates the sound of men speaking. - [Arwen Apps translation, 2011]

Aberdeen Bestiary [circa 1200 CE] (folio 12r): In a part of Ethiopia the hyena mates with the lioness; their union produces a monster, named crocote. Like the hyena, it too produces men's voices. It never tries to change the direction of its glance but strives to see without changing it. It has no gums in its mouth. Its single, continuous tooth is closed naturally like a casket so that it is never blunted.