The scientists first played the birds two recorded sounds that they likely had never heard before. One was a warning cry of an allopatric chestnut-rumped thornbill, a bird not native to Australia. The other was a computer-generated bird sound called " buzz" .

家首先向儿播放了两种它们以前从未听过的音。一种音异域的栗尾刺嘴莺的警告声，这种澳大利亚本土的。另一种音电脑生成的" 嗡嗡" 叫声。