The Crows' Challenge

Two crows challenged each other to see wich one of them could fly the highest while holding a sack of the same size. The first crow filled his sack with cotton and laughed at the other crow who had filled his sack, instead with salt which was much more heavier. When however, it began to rain, just as the second crow expected, the salt began to desolve. The cotton on the other hand absorbed the rain and became so heavy that the first crow did not even have the strength to even get off the ground and had to admit defeat!