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The Invisible Blood - Antarctic icefish survive in freezing waters with transparent blood that lacks red blood cells, allowing oxygen to dissolve directly into their plasma. Their blood contains specialized antifreeze glycoproteins that stop ice crystals from forming, protecting them in subzero temperatures. Combined with semi-translucent skulls that may aid camouflage or sensing light, these adaptations make icefish one of the most remarkable examples of evolution in extreme environments.