I remember reading this story some time ago, and the part that got stuck in my mind was the one about the Whishpoosh (the monster beaver) swallowing a whale... How ridiculously big could he have been to be able to do such a thing?
Also, the ending is very interesting and amusing. The god Ecahni cuts mouths for the coastal tribes, and he jokingly makes them crooked. He he... I imagine the coastal tribes being rather upset about this story...