For example, it is claimed that when a recording of the male emu’s call is played shortly before the eggs hatch, the movements of the chicks inside cause the eggs to sway back and forth.
وقبيل ان يفقس البيض ،‏ أسمعوا الصغار هذا الصوت فتحركت الى حد جعل البيض يتأرجح .‏