Figure 1. Robin (Turdus migratorius) making a call to another robin. Flickr photo by Richard Towell https://live.staticflickr.com/4111/5206897797_695ceec550_z_d.jpg shared under a Creative Commons (BY-SA) license.
Figure 1. Robin (Turdus migratorius) making a call to another robin. Flickr photo by Richard Towell https://live.staticflickr.com/4111/5206897797_695ceec550_z_d.jpg shared under a Creative Commons (BY-SA) license.
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