National Audubon's Corkscrew Swamp Sanctuary is birdy at any time of year. But in winter, this mixture of cypress swamp and pineland comes alive with migratory songbirds. On a warm, sunny morning, birds are active all around, from the tops of the tall cypresses to the shrubs along the boardwalk. An Eastern Phoebe, after spending the summer in Pennsylvania, calls from a dead branch over the water. A Palm Warbler, all the way from Ontario, moves through the undergrowth. And this Blue-gray Gnatcatcher, having migrated from a similar swamp in Georgia, forages in a willow. Many birds find the habitats they need in the Corkscrew Swamp Sanctuary.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.