Anatomy: Animals Inside
What animals have different colored blood than humans?
The color of blood is related to the compounds that transport oxygen. For example, hemoglobin containing iron is red and is found in all vertebrates and a few invertebrates. Annelids (segmented worms) have either a green pigment, chlorocruorin, or a red pigment, hemerythrin. Some crustaceans (arthropods having divided bodies and generally having gills) have a blue pigment, hemocyanin, in their blood.