As you can see in two of these images above the dragonflies tails are pointing straight up. You're asking "Why dragonfly do that"? The answer is that it's not just a tail, it's their abdomen. Dragonfly breathe through their abdomen. By pointing their tail straight up is their way to reduce the exposure of their abdomen to the sun. If you notice that sometimes they have a cooler looking abdomen, that means cooler air drawn in. If it looks warmer meaning warmer air drawn in.
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