All the birds were called together. To them was said, “Whichever one of you can fly farthest into the sky shall be chief.” All the birds flew to a great height. But Wren got under the thick feathers of Eagle and sat there as Eagle flew. When all the birds became wing-tired, they flew down again; but Eagle flew still higher. When Eagle had gone as far as he could, Wren flew still higher.

When all the birds reached the ground, Eagle alone returned, after a great while. Behold! Wren only was absent. So they awaited him. At last he returned. Eagle had too highly been thinking of himself, being sure of being made chief; and behold! Wren was made chief.

The purpose of this legend is most likely to teach a lesson related to

the intelligence of different birds.
the dangers of being too proud.
the importance of doing your best.
the thrill of getting ahead in life.