Bluebirds in Hidden Valley - Teatown Lake Reservation Date: 04/13/13 Hours: 10am-12pm Ages: All Price: $5 Address: 1600 Spring Valley Road - 914-762-2912 Ossining, NY 10562 teatown.org Description: The old fields in Hidden Valley provide shelter and a plentiful source of food for our state bird, the Eastern Bluebird. After a short hike to look for bluebirds, return to the Nature Center to construct a bluebird box to put in your own backyard. Please note that this program is for families with children ages 6 and older. Children must be accompanied by an adult. One box per family.