Perry's Index to the Aesopica
Fables exist in many versions; here is one version in English:
THE LIZARD AND THE SNAKE
They say that there was once a lizard who burst into pieces right down the middle
when he was trying to equal the length of a snake.
You will hurt yourself and accomplish nothing if you try to imitate someone
who is far better than you are.
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.
In Perry 268, the earthworm
envies the snake and stretches out to equal the snake in length
until it bursts into pieces. In Perry 371,
the same story is told about a lizard trying to equal the length
of a snake. The most famous fable of this type is the Perry
376 the frog who tried to puff herself up until she would be
as large as a bull.
Perry 371: Gibbs (Oxford) 347 [English]
Perry 371: Babrius 41 [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.