The raven has himself to blame also for the awkward hop in his gait. He observed the graceful step of the dove, and envious of her tried to enmulate it. The outcome was that he almost broke his bones without in the least succeeding in making himself resemble the dove, not to mention that he brought the scorn of the other animals down upon himself. His failure excited their ridicule. Then he decided to return to his own original gait, but in the interval he had unlearnt it, and he could walk neither the one way nor the other properly. His step had become a hop betwixt and between. Thus we see how true it is, that he who is dissatisfied with his small portion loses the little he has in striving for more and better things.
Jewish Legends
Legends of the Jews 1:65