The nightingale and the sparrowhawk

Perched on a tall oak, a nightingale sang as usual. I saw a hungry hawk, and immediately rushing upon him, seized him in his talons.

Sure of his approaching death, the Nightingale begged her to let him go, telling him that he would not be sufficient to fill your belly, and if really hungry, you should seize a larger one. The hawk replied:

-Necio Would be if you hear and let slip the prey that I have to go find that I have not even seen.

A bird in the hand, two in the bush.