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Sat, Dec 26, 2020 1:37 PM

Birds: Competition for mates leads to a deeper voice than expected based on size -

Birds: Competition for mates leads to a deeper voice...

Nature |

Birds: Competition for mates leads to a deeper voice...

https://imgs.plurk.com/Qyg/aXM/UpvDMus9gS51qHN7NkWvc7nRcTm_lg.png

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