Ah, Gohm's "atom" idea has some potential in it!
Regarding the Beaver and Biggie's CE description, we can say it does have lots of energy (they can build/rebuild those dams pretty quick), making a difference to it's surroundings (their damns help with the ecology of the area). With the tools.. it uses its teeth for cutting wood and claws for carry mud. Simple tools yet able to do amazing feats
The bad thing however, is that its already a mascot for MIT and other tech uni's.