Medium:

Genuine chewed up wood by a beaver ( marks still visible ), beaver teeth , and sweet gum tree pods.

The beaver is the biggest rodent in North America, known as the most amazing builder of the animal kingdom.
Building intricate dams on ponds rivers and lakes to elevate the water level’s creating and supporting an echo system for fish amphibians, and birds. The damn acts as a home for the beaver with the only access being underwater, (see diagram )providing protection and shelter against its predators like wolfs, bears and coyotes.
The biggest beaver dam in the world was discovered in 2007 in a remote area in Alberta Canada It spans for 2,800 feet and can be seen from space.
The picture’s above are from the actual beavers lodge this wood is from. located in Upstate NY

 Beavers teeth never stop growing, as much as 4 feet per year, they love to eat the bark and leaves from the trees that they fell. Their constant gnawing on wood keeps their teeth from growing too long.
The teeth appear orange-yellow in color, because the thick enamel contains iron deposits which keep the teeth strong so they are able to chew through large tree trunks.