One welcome sign of spring is the song of the spring peepers, the tiny frogs whose nighttime chorus signals that winter has come to an end. (That's a spring peeper, sitting on a leaf, at left.) Learn more about them, and all kinds of reptiles and amphibians that are beginning to stir, at our Signs of Spring program at 7 p.m. Wednesday, April 22. Baltimore Woods Nature Center educator Tom Meier, accompanied by a creature from the nature center, will talk about herpetology, the study of reptiles and amphibians. See close-up photographs of native salamanders, learn how frogs freeze and thaw like a block of ice, and find out about the spring event that herpetologists call “Big Night.” The program is for all ages. The series is funded by the Friends of Seymour Library.