One winter, when the birds were all leaving for south and warmer areas, one little bird broke its wing on the way and was left behind. Soon frost and snow covered the forest and he was cold and hungry. So he asked the trees to help him and let him stay in its branches. However, the trees are not always kind. The birch tree was proud of being beautiful and haughtily replied to the bird's pleas by saying that he could not possibly help him because he had to look after the birds of the forest first. The strong oak tree was reluctant because it was afraid that the bird would have to live there till spring time and would eat up some of its acorns. Even the willow tree that seemed to be gentle otherwise refused to help or even talk to the strangers.
The poor bird was in much distress and tried to fly some more but his wing was still not fit for the purpose. Seeing him struggling like this, the spruce tree asked him, why he seemed so downcast. When the bird revealed his miseries, it offered him the thickest, softest and warmest branch to stay. The bird was really glad to find some help.
Inspired by the kindness of spruce tree, the big and strong pine tree also volunteered to protect the spruce tree and the bird from the North Wind all through the winters. The little juniper tree also piped in to offer its berries to the bird to quench his hunger. So, the bird lived comfortably there and flew away again at springtime, when its wing healed again.
The Frost King, who kept close note of the behaviour of all trees, strictly instructed the North Wind not to touch even a single leaf of the kind spruce, pine and juniper trees; while he was free to play havoc with the leaves of other trees. The North Wind especially enjoyed in plucking the shining, green leaves of the willow, oak and bird trees and leaving them bare for the winters, with nothing to protect them from snow, rain and sleet. It is for this kindness that the leaves of the spruce, the pine, and the juniper are always green and they are known as evergreen trees.