Three young brothers go into a large, dangerous forest to play despite their parents forbidding it. It gets dark and they get lost, hearing a noise that frightens them. They run home as fast as they can, but discover they have turned completely green from fear. Their parents take them to a witch for help, who says the only cure for their condition of "verdicella de la por" (fear greenness) is a potion made from the hairs of a wolf, which the boys must pluck themselves. The oldest brother comes up with a plan to lull the wolf to sleep by singing him a lullaby, which works. The boys then pluck hairs from the sleeping wolf and