Thick-shelled eggs can crack those of other birds when dropped from a height.
Learn more: http://www.sciencemag.org/news/2018/05/cowbird-eggshells-could-double-deadly-weapons
Read the paper: https://academic.oup.com/beheco/advance-article-abstract/doi/10.1093/beheco/ary045/4975423
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A. V. López et al.,
Behavioral Ecology 2018
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Analía V. López