Dump nesting occurs when a number of females lay eggs in a single house, which can result in clutches with over 70 eggs. Mississippi State University did a study to reduce this problem. A smaller nest box was designed. Although fewer ducklings are fledged from each box, the survival rate is improved. This box comes with a wire ladder and nesting chips, and the front opens for observation and cleaning. RANGE: Breeds from British Columbia south to California, and from Montana east to Nova Scotia, and south to Texas and Florida; absent from Rocky Mountains and Great Plains. Winters near Pacific Coast north to Washington, and to New Jersey in East, rarely further north. Measures approximately 17" h x 7 1/2" w x 15" d. Made in Maine from eastern white pine.