First stimuli presented in the habituation series. The focal subject (Bird 062-98389) responds to hearing the first chur call in the habituation series, in this instance from a 'familiar' individual (Bird A), by a rapid and large head turn.
This research was published in the journal Biology Letters in the paper: 'Cooperative bird differentiates between the calls of different individuals, even when vocalizations were from completely unfamiliar individuals' by Paul G. McDonald. The doi link for the article is http://rsbl.royalsocietypublishing.org/lookup/doi/10.1098/rsbl.2011.1118
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