Here is a myth with a beaver in it from an Oregon homeschool website.

How Raven Stole Back the Cedar Trees
There once was a village up north near the Pacific Ocean. One day a girl named Small Foot who lived in the village noticed that there were no cedar trees! Raven also noticed and began searching for them right away. He was about to give up for that day when he saw Beaver carrying a bunch of cedar trees! Raven followed Beaver to his home and there laying by the water were all of the cedar trees that were stolen. Raven turned into a beaver and asked Beaver if he could help. He said, "Yes." As soon as Beaver wasn't looking Raven turned back into a crow and took all of the cedar trees back to the village. When he got back he put all of the trees back in place. The people in the village thanked Raven, and Raven flew into the bright sky.