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.

A house cat stares down a leopard in a suburban backyard. The big cat growls, the child in the background freezes, and—against all odds—the cat lunges. The leopard turns tail and bolts. Within seconds ...