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Commented on Towards a taxonomy of cliches in Space Opera
Gliding is common. Powered flight has evolved four times: insects, birds, bats, pterosaurs. Yeah, part of the reason it's hasn't more is probably competition/predation from the animals already there, but it clearly isn't that easy to evolve. It doesn't seem...
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Commented on Towards a taxonomy of cliches in Space Opera
A few biology ones: Species can have stable populations that survive mostly by cannibalism. Things that have only evolved one or a few times on Earth will always be present in alien biospheres (feathers, lactation, powered flight, flowers). Things that...