Support WBURBrotherly (And Sisterly) Love In The Animal WorldPlay03:14Download AudioSelena Simmons-DuffinNovember 26, 2010 ShareTwo captive Cattle egret (Bubulcus ibis) sisters at the National Zoo in Washington D.C. This species of heron are known to practice siblicide when the parents are away from the nest hunting for insects and fish. (NPR)
