A Pigeon, oppressed by extreme thirst, saw a cup of water painted on a signboard next to a road. Not realizing it was only a picture, she flew towards it with a loud whir and smashed against the signboard, jarring herself terribly.

Having broken her wings by the blow, she fell to the ground, and was caught by one of the bystanders.

Moral: Zeal should not outrun discretion.