Why do penguins buzz?
from gizmodo http://www.gizmodo.co.uk/2017/08/scientists-crack-the-code-of-the-antarctic-penguins-mysterious-undersea-calls/
from gizmodo http://www.gizmodo.co.uk/2017/08/scientists-crack-the-code-of-the-antarctic-penguins-mysterious-undersea-calls/
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