Fig. 4
From: Identification of vocal individuality in male cuckoos using different analytical techniques
Similarity of paired calls from different days within the same male, from three banded males. Red dotted line indicates the threshold used to distinguish calls from belonging either to the same or different males in Fig. 3. 1-day: calls from the same day; 2-day: calls from two consecutive days; 3-day: calls from days with two days interval; 4-day: calls from days with 3 days interval; 5-day: calls from days with 4 days interval