Blood is blue when you are an animal that has copper in the blood, rather than iron. The blue whale is not the only animal with a huge appetite. Could their blue blood be the key to their survival? However, the heart of a fish has two chambers. The hearts of amphibians and reptiles (except crocodilians) have 3 chambers. The animals you are referring to are categorised under Mollusca and Arthropoda classes. Human blood is red because it has a red pigment called hemoglobin which contains iron. Those that have iron in the hemoglobin to carry oxygen. Lobsters and crabs are known to have blue blood. But the vital liquid exists on a color spectrum. Arthropods with copper in the hemolimph to carry oxigen is clear opaque.

Stay tuned right here to find out the answer. Medicinal leeches are famous for drinking blood, and have been used to heal wounds and thin the blood for centuries. Fish and frogs (amphibians) have only one heart; and its blood is red (as with all vertebrates -- animals with a backbone.) The second answer is a little misguided. Blood is blue when you are an animal that has copper in the blood, rather than iron. Natural selection has engineered blue-blooded invertebrates, green-blooded reptiles and fish with transparent fluids in their veins. Oxygenated it becomes red. Blue and red are not the only possible colors of blood — some animals bleed green. Many insects and spiders, however, have blood that is known as hemocyanin, which uses copper to transport oxygen about their bodies and creates a blue tone when it is exposed to the air. Oxygenated it becomes green. Horseshoe Crabs are one such animal. It’s All About Evolution. So the blood has faster and easier access to the organs and blood veins are not needed. Squid, Octopus, Horseshoe crab and certain insects and their larval stages have blue coloured blood. The color of the blood is determined by the metallic content. Prasinohaema skinks are green all over. Their blood contains amebocytes, which play a similar role to the white blood cells of vertebrates in defending the organism against pathogens. Blue bloods Nearly unchanged for hundreds of millions of years, horseshoe crabs have some unusual traits. The reasoning for this is the pigment containing protein called hemocyanin, which has a blue color due to the copper in the molecular structure. Roses are red, violets are blue … and these lizards’ blood is green. So, sink your teeth into this list of eight animals that vant to drink blood. Why on Earth do octopuses and squids have blue blood? Not all animals have red blood.

Some have hemoglobin like us, some have different respiratory pigments, and some have no respiratory pigments at all.

Having relatively poor eyesight, the animals have the largest rods and cones of any known animal, about 100 times the size of humans', ... their blood is blue. Spiders and peanut worms have blue and purple blood, respectively. The circulatory fluid in leeches and segmented worms is green coloured. These arthropods' blood uses a different protein, called hemocyanin, to bind oxygen.