Why is there a picture of a bear on the cover, but the novel is titled Sign of the Beaver?

If you read the book, the story is about a boy who survives in his dad's log cabin all alone for a long period of time. He eventually beferiends a Native American boy and the Native American boy shows him the sign of the Beaver which is the sign that shows that it is the territory of the Beaver tribe

Maybe it's a beaver, but you can't see the tail?