The Wolf in Sheep's Clothing

Once upon a time, a bunch of sheep that were renowned for their fluffy, soft wool lived in a lush, grassy area. One day, a sneaky and crafty wolf devised a scheme to con the sheep and acquire his food.
He assumed the appearance of a sheep by donning a woolen robe and approaching the herd while bleating and acting in sheeplike manner. The sheep welcomed the wolf into their group and asked him to join them on the green field, unaware of the wolf's presence.
The thought of all the wonderful lamb chops he would soon be eating had the wolf lick his lips as he feigned to graze beside the sheep. However, the wolf's scheme was thwarted when an old, knowledgeable sheep realized that the newcomer's paws and fangs were far too large and pointed to be those of a true sheep.
The remainder of the flock soon fled after the wise old sheep warned them, leaving the wolf disappointed and defenseless.
The lesson of the tale is to be on the watch for danger and to be wary of those who might not be who they appear.