Every time a woodpecker carves a new nesting hole, it's building more than just a home for itself—it's establishing a vital apartment complex for the entire forest. Follow the lifecycle of a single tree cavity, from the first chisel of the Pileated Woodpecker to the moment it shelters flying squirrels, small owls, and a host of insects. Discover how this tireless "architect" creates the indispensable housing that keeps the ecosystem thriving.