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No, not all. Only vertebrates, with a few exceptions, have blood with this color – caused by the presence of iron-rich cells, called hemoglobin, which have a reddish hue. Vertebrates, it is worth remembering, are divided into five major groups of animals: mammals, birds, fish, amphibians and reptiles. Among invertebrates, blood color varies greatly. Crustaceans (crabs, crabs, lobsters, etc.) have blood that is more bluish in color, thanks to the presence of a pigment called hemocyanin.
Insects, in turn, have a type of blood (called hemolymph) that can be yellowish, bluish or greenish – in certain species of ants it can even be colorless. “Another peculiarity about the blood of insects is that it does not flow inside a system of pressurized vessels, as we humans do, but travels through wide spaces and bathes the various organs, which are delimited by very thin membranes”, says the entomologist (insect specialist) Sérgio Vanin, from the Institute of Biosciences at USP. As every rule has its exception, among invertebrates there are also species with red blood, such as earthworms and some aquatic larvae of certain mosquitoes.