My layman theory for why it hasn't happened yet is that evolutionary pressure is... | Hacker News

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		mherrmann on Oct 28, 2016 \| parent \| context \| favorite \| on: Common swifts can stay aloft for up to 10 months My layman theory for why it hasn't happened yet is that evolutionary pressure is not high enough. I believe the main advantage of not having to breed on land would be safety from predators. I guess there is no shortage of "safe" places.

throwanem on Oct 28, 2016 [–]

Islands nobody's ever heard of, where they can build nests safe from predators that don't exist there.

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