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Animal Blood Comes in Blue, Green and White, Scientists Explain

Original: The Bloody Palette of the Animal Kingdom Goes Far Beyond Red. These Creatures Have Blood That Runs a Chilling Blue, Brig

Smithsonian Magazine is highlighting the surprising range of blood colours in the animal kingdom. Beyond red blood based on iron-rich haemoglobin, some creatures run blue blood using copper-based haemocyanin, others have green blood, and certain fish survive with milky white blood that lacks red pigment entirely. The article explains the chemistry behind these pigments and the animals that carry them, from horseshoe crabs to icefish.

Why now: The striking science fact about unusual blood colours is being widely shared as a curiosity piece.

Smithsonian Magazinehorseshoe crabsicefish

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