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Living on Earth
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The Effects of Dark Wings on Dragonflies
Male dragonflies are becoming less dark as a way to stay cool. That must mean then that the less dark males survive better and we're better able to reproduce more fit offspring. There's a few possibilities here. It could be that the females simply choose to mate with males that have less wing coloration just like you said. Or if they can't find those males because all of those males have died or they're simply too warm to go to the breeding aggregations, then the females might not mate at all. So we don't know which of those possibilities is occurring yet.
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