What Is Hemoglobin?

By jamie

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7. Blue Blood

People that are at the highest echelons of society, such as members of royal families, are often said to have blue blood. Of course, this is not true and their blood is the same color as ours, but there are some animals that genuinely do have blue blood.

Some animals, such as spiders and octopuses, use (blue) hemocyanin instead of hemoglobin. Some animals like some worms and some leeches have green blood thanks to the presence of chlorocruorin. There are even some animals with purple blood because their blood contains hemerythrin. Despite the different colors thanks to the presence of different minerals, these different colors of blood essentially do the same thing.

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