A Dam Too Far / Long In the Teeth

M1, T2: Counting on the natural beaver reflex to dam running water, the government air-drops Norb and Dag into a flood zone.  What the government hadn't calculated was that the boys' constant squabbling would create a log jam of its own. Norb starts a "forest fad" when his teeth grow super long after he forgets an important beaver rule: chewing.