The Two Brothers is a German fairy tale collected by the Brothers Grimm, tale number 60. It is Aarne-Thompson type 567A, the magic bird heart, and type 303, the blood brothers.
A rich goldsmith and a poor broommaker were brothers. The broommaker had two identical twin sons. One day, the broommaker saw a golden bird in the woods, knocked off a feather, and sold it to his brother for a great sum. He pursued the bird again and found a golden lamp. A third time, he brought back the bird itself, and his brother, who knew its powers — that whoever ate its heart and liver would find a gold coin beneath his pillow every night — had his wife cook it. But his nephews came to the kitchen to beg, and when two bits fell from the bird, they ate them, and the gold coins appeared beneath their pillows.
The goldsmith told his brother that his sons were in league with the devil, and persuaded him to abandon them. A huntsman took them in and taught them his trade. Once they were grown, they begged his permission to seek their fortune. He was pleased, because they talked like brave huntsmen, and he let them go. He then gave them a knife with directions that if they ever parted, they should stick the knife into a tree, and when either one returned, he could see how his brother was faring because the blade's side would rust if things were going badly for him.
On the way, they nearly shot a hare for hunger, but it begged for its life, offering to give them two young hares instead, so they let it go. The same happened with a fox, a wolf, a bear, and a lion. The young animals showed them a village where they could buy food. They parted ways, each one taking half the animals, and drove a knife into a tree where they parted.
The younger came to a town all hung in black, where a dragon had eaten every young maiden except the princess, who was to be given to it the next day. The huntsman climbed the dragon's hill and found three cups and a sword. He was unable to wield the sword until he had drunk from the cups.
The next morning, the princess was brought to the hill, and the king's marshal watched. The seven-headed dragon came and breathed fire, setting all the grass ablaze, but the animals trampled the flames out. The huntsman cut off six of its heads and its tail and had the animals tear it to bits. The princess distributed her necklace among the animals, and gave the huntsman her knife, with which he cut off the dragon's tongues. He was exhausted and told the lion to keep watch while he slept, but the lion was also exhausted, and told the bear to keep watch, and so on down to the hare, who had no one to tell to keep watch. The marshal cut off the huntsman's head and forced the princess to promise to say that he had rescued her.