To fly or not to fly?

Evolution can do funny things. Like producing the amazing feat of flight in a lineage of reptiles, which over time led to an adaptive radiation seldom rivaled in the history of animals. And then producing, in some 30 species of birds, the loss of the adaptation altogether. It would seem a ridiculous thing to do, to give up the power of flight, when you can fly. Certainly, if I could fly, I wouldn’t bother giving it up. That’s Rory...

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