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May 12, 2018 11:59 am PDT
Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/d2QjtXTvbgo/watch-how-unhatched-birds-get.html
Watch how unhatched birds get oxygen inside their shells
How birds get oxygen inside their eggs. File this great explainer under "questions previously unconsidered that have interesting answers." (more…)
Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/d2QjtXTvbgo/watch-how-unhatched-birds-get.html
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