Perry's Index to the Aesopica
Fables exist in many versions; here is one version in English:
THE DONKEY AND THE THORNS
A donkey was eating the spiny leaves of a thorn bush when a fox happened to
see him. The fox crept up and said, 'Hey you, how can you chew and swallow such
tough food with your flabby, flapping tongue?'
Aesop's Fables. A new translation by Laura
Oxford University Press (World's Classics): Oxford, 2002.
cover, with new ISBN, published in 2008; contents of book unchanged.
Perry 360: Gibbs (Oxford) 553 [English]
Perry 360: Babrius 133 [Greek]
Perry 360: Chambry 280 [Greek]
You can find a compilation of Perry's index to the Aesopica in the gigantic appendix to his
edition of Babrius and Phaedrus for the Loeb Classical Library
(Harvard University Press: Cambridge, 1965). This book is an absolute must for anyone interested
in the Aesopic fable tradition. Invaluable.