Some creatures in wildlife carry blue, green, purple or even colourless blood. Discover 10 fascinating animals with the strangest blood colours on Earth. The ancient horseshoe crab has bright blue blood. It uses copper-based haemocyanin instead of iron, allowing it to carry oxygen efficiently in cold ocean waters. Octopuses also have blue blood. Living in deep, low-oxygen seas, their copper-rich blood... [1091 chars]
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