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Alien - The Arrival

The aliens from Arrival look vaguely human for a few unique features. The most striking difference, and the reason they are able to leap about with super-human strength, is their inverted leg joints: an entirely plausible morphology, even though it looks so weird and creepy to us. They also had two fleshy flaps on the back of their heads loosely covering the brain. It was an interesting design choice, but seems to leave the vital brain area unnecessarily exposed to damage.