View the bluebirds without disturbing them. This nest box has a plexiglas panel to keep birds safe during observation, but slides out easily for cleaning. RANGE: Breeds east of the Rockies from southeastern Canada to Gulf of Mexico. Winters in southern part of breeding range and Mexico. Measures approximately 12 1/2" h x 6" w x 8 1/2" d. Made in Maine from eastern white pine.