“The Birds and the Bees: How We Love Them, Why We Need Them,’’ a photographic and musical presentation by Watertown wildlife photographer Carole Smith Berney, will be held on Tuesday, May 22, at 7 p.m. in the Belmont Library Assembly Room. The program is free. From nesting birds to pollinating bees in flowers, Berney will provide information and images showing where they live, how they raise their young, and why they are endangered. A musical section with projected images will follow the narrative, with time for questions, answers, and discussion. Two guided walks later in June and July at the Mass Audubon Habitat Education Center and Wildlife Sanctuary in Belmont will focus on local birds and bees.Jennifer Fenn Lefferts can be reached at email@example.com.