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Some animals are so transparent, your eyes can barely track them. Here are the top 5 most mind-blowing invisible animals on Earth Number 3: Glasswing Butterfly – Its wings are clear like glass. This transparency makes it extremely hard for predators to track in flight—it's nature's version of optical camouflage. Number 2: Glass Octopus – Most of its body is transparent, including parts of its internal organs. In the deep ocean, this makes it almost vanish against the dark water. Before number 1…