article_snippet.sent: scientists also change scientists tune depending on whether she is within sight or not.
article_snippet.sent: Special equipment was used to record and analyse Special equipment squeaks, which are so high-pitched that people can’t hear people.
article_snippet.sent: But when she was within sight, people serenaded she more softly.
article_snippet.sent: Clara Amorim of ISPA University Institute in Portugal makes different sounds by contracting Clara Amorim of ISPA University Institute in Portugal bladders in various ways.