7 Creatures With Surprisingly Colorful Blood

Octopus and Squid

They contain hemocyanin, a copper-based molecule that turns blue when oxygenated, so that’s why they have blue blood.

Lizards

Some species of Lizards, such as skinks, contain green blood due to a pigment called biliverdin.

Icefish

They lack hemoglobin entirely so they have colorless blood and the oxygen they take dissolves directly in plasma.

Leeches

They use a green pigment, chlorocruorin, which is similar to hemoglobin, which is why blood has different colors.

Brachiopods

They utilize chlorocruorin, like some annelids, which gives their blood a green tint.

Sea Cucumbers

Some have vanabin, a vanadium-binding protein that contributes to yellow or greenish blood in their body.

Marine Worms

Their blood has a purple or pink hue because they may use hemerythrin which lead to it.