User blog comment:BastionMonk/No feathers in JPIV/@comment-6493791-20130322025911/@comment-1791057-20130322052014

We don't just "think", we know:

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Feathers aren't just good for insulation, they're good for cooling too. Feather deflect the sun's rays and keep the sun off the skin, which is where the heat receptors are. And yes, some of them flew, and most of them fly today.