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The Most Alien-Looking Creatures Earth Has Produced

Membracidae always amaze me.
Of course, we could focus on deep-sea invertebrates all day; they're 'alien' to us in so many ways.

So, to bring the topic into our own suborder, I think tarsiers look like something from an alien forest.

After the Sarcastic Fringehead, my second favourite fish has to be Exocoetidae:
Those amazing fins/wings are reminiscent of the giant dragonflies from the Carboniferous era.

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Yep, I've seen them in action on a ferry in Honduras - it took me a little while to work out what I was looking at as they leapt out of the water to flee the ferry and skimmed off across the waves. They really did look like giant dragonflies at first.