Use pine branches from the great outdoors for art stamping. Here are directions from pine branch painting. You can use pine cones, nuts, short branches of wood and stones as well.
You can use this fox finger puppet pattern for almost any animal. Change the material, add long incisor teeth and round the tail and you can make a beaver finger puppet.
One of our favorite books is the Sign of the Beaver. Both boys and girls enjoy this adventure. Check out Sign of the Beaver Cyber Guide by Bonnie Elias. It has great links and ideas for an in depth study. Best of all, the guide is free.