Woodpeckers - including this Northern Flicker - are master carpenters of the bird world. They're called "keystone" species for their crucial role in creating habitat suited to other woodland wildlife. Abandoned woodpecker nest-holes become nests or roosts for small owls, cavity-nesting ducks, swifts, bluebirds, swallows, wrens, and other birds, as well as many small mammals. More info and transcript at BirdNote.org. Want more BirdNote? Subscribe to our weekly newsletter. Sign up for BirdNote+ to get ad-free listening and other perks. BirdNote is a nonprofit. Your tax-deductible gift makes these shows possible.