Offering a sighting a day for America’s 51 million birders, Audubon Songbirds is now in its 15th successful year. Every month, meet dozens of familiar backyard songsters up close and in full color. A Black-capped Chickadee hanging from a snowy branch. The Buff-bellied Hummingbird sipping nectar from a bright flower. An exuberant Yellow Warbler proclaiming his territory with song.