Altruism in owls? Chicks perform surprisingly generous act
https://www.sciencemag.org/news/2016/05/altruism-owls-chicks-perform-surprisingly-generous-act
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Altruism in owls? Chicks perform surprisingly generous act
https://www.sciencemag.org/news/2016/05/altruism-owls-chicks-perform-surprisingly-generous-act