A scientific report has revealed why some animals have blue, green, or purple blood. Horseshoe crabs, octopuses, and squids have blue blood because they use copper-based haemocyanin to transport oxygen throughout their bodies, unlike the iron-based haemoglobin found in humans.
The green-blooded skink owes its unusual color to extremely high levels of biliverdin, a bile pigment that saturates its tissues and even bones with a green hue. This remarkable adaptation sets it apart from most vertebrates.
The peanut worm has purple blood due to hemerythrin, an oxygen-carrying molecule that gives the blood its distinctive violet tone. This diversity in blood color reflects the remarkable variety of oxygen-transport mechanisms that have evolved across different species. #Biology #AnimalBlood #Science #Haemocyanin #Nature
