10 Animals with Unique Blood: Blue, Green, Yellow and Purple

Octopuses and Squids  These intelligent invertebrates have copper-based hemocyanin in their blood, giving it a bluish hue. Hemocyanin binds oxygen less efficiently than hemoglobin,

New Guinea Skink  This lizard boasts bright green blood due to high levels of biliverdin, a bile pigment.

Glass Frogs  These amphibians have translucent skin that reveals their internal organs, including their clear blood vessels.

Clingfish  While not entirely yellow, the blood of these fish appears slightly yellowish due to the presence of bilirubin, another bile pigment.

Brachiopods  These marine invertebrates have a unique copper-based pigment in their blood that gives it a purplish color.

Spiders  These eight-legged wonders share the blue blood trait with other arthropods due to hemocyanin.

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Lobsters and Crabs  Similar to their crustacean cousins, these creatures possess blue blood thanks to hemocyanin.

Peanut Worms  These marine invertebrates have purple blood containing hemerythrin, an oxygen-carrying protein.

Horseshoe Crabs  These ancient arthropods also possess blue blood due to hemocyanin.

Crocodile Icefish  Found in the icy waters of Antarctica, these fish lack red blood cells and hemoglobin.