Penguins are the first seabirds we have recorded making sounds under water – they may be calling out for help when they hunt or making noise to disorient their prey
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https://www.newscientist.com/article/2238025-penguins-call-out-as-they-hunt-under-water-but-were-not-sure-why/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home
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