The gang learns about dams./A bird drops a little oyster named Elroy on Nature Cat's head. The gang goes looking for their sleepy hammock and meet a family of beavers using trees to build a dam.

In the series finale, Nature Cat and his pals realize they've come to the end of their Nature Curiosity List. Meanwhile, Sir. Galahad gives himself the title of King and moves into a barren castle and ...