Berechiah is known chiefly as the author of "Mishle Shu'alim" (, 'Fox Fables'), a set of over a hundred fables in rhymed prose, some of his own invention and some reworked from Aesop's Fables, the Talmud, and Eastern sources. Most were probably translated from the French fable collection "Ysopet" by Marie de France (though uncertainties about the exact dates of both authors preclude any final decision about which of them was the source for the other). Other likely sources include the Latin translations of Aesop by Romulus and Avianus and of the Panchatantra. Berechiah's work adds a layer of Biblical quotations and allusions to Aesop's tales, adapting them as a way to teach Jewish ethics.