Is the blood of all animals red?

Here's another surprise: A variety of animals bleed colors other than red. The ocellated icefish, for instance, may brush fins with the Antarctic octopus in the same chilly habitat, but its blood is quite different. It runs completely clear. read more

No, only animals with hemoglobin have red blood because of the presence on iron(Fe) in their blood. However there are others like hemocyanin which is blue due to the presence of copper(Cu), this type of blood is found in organisms of the sub-phylum Mollusca, where you find animals like snail, octopus, squid, cuttlefish etc. read more

Blood isn't always red—evolution has given rise to a variety of hues. read more

The color of blood is related to the compounds that transport oxygen. Hemoglobin, containing iron, is red and is found in all vertebrates (animals having a backbone) and a few invertebrates (animals lacking a backbone). Annelids (segmented worms) have either a green pigment, chlorocruorin, or a red pigment, hemerythrin. read more