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.
Väidetakse, et kui linnupoegadele lastakse vahetult enne koorumist isase emu häälitsustega salvestisi, hakkab muna poja liikumisest edasi - tagasi kõikuma.