Read more: https://asknature.org/strategy/respiratory-system-facilitates-efficient-gas-exchange/
TIL birds have two lungs and two additional air sacs which allow breathing to continuously flow in a single direction through their respiratory system. This allows oxygen intake even when they exhale, which is especially needed at high flying altitudes.
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I was on a training course that told me about that. I was more surprised at birds don’t take a piss 😂 their excrement is a mixture of both 🤯