These Pigeons Have Built-In Warning Alarms

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Scientists have figured out that some birds come with built-in alarm calls in their wings

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Sources:

http://www.cell.com/current-biology/fulltext/S0960-9822(17)31268-X
https://www.eurekalert.org/emb_releases/2017-11/cp-cpu110217.php
http://rspb.royalsocietypublishing.org/content/276/1676/4173
https://www.wired.com/2014/03/birds-sing-morning/
https://www.nature.com/articles/doi:10.1038/nm.4433
https://www.eurekalert.org/emb_releases/2017-11/uoc--soa110317.php
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