Ninja Beaver

Facts:

1. Noah like to gnaw on wood.  He chewed up the end of Izzie's bed and did the same to his once he got his own bed. 
2. Noah is convinced he has a tail.  If you ask him to show you where his tail is, he points to his bottom.  We tried sticking a sock out of the back of his jeans and said, "Look, now you have a tail!"  His response was, "Look, I have another tail!"
3. Noah likes to make strange animal like sounds.
4. Noah likes to burrow himself into his bed at night.  He piles all of his blankets and pillow on top of himself and curls up into a little ball underneath.

 

Exhibit A

Exhibit B

 

Conclusion:
After adding these characteristics with Noah's other...uh, cloak-and-dagger skills we have resolved that Noah has morphed into a Ninja Beaver.