23 Jul '13 17:36>
http://www.pnas.org/content/early/2013/07/17/1304459110 for the abstract or the full article if you don't mind paying.
http://www.bbc.co.uk/news/science-environment-23410137 for a media report.
They have signature whistles which are specific to each individual. They will always respond to a call of their signature whistle by calling it back. They don't respond to other whistles and don't respond to calls of signature whistles from other groups.
http://www.bbc.co.uk/news/science-environment-23410137 for a media report.
They have signature whistles which are specific to each individual. They will always respond to a call of their signature whistle by calling it back. They don't respond to other whistles and don't respond to calls of signature whistles from other groups.