* Vertebrates: Mammals, birds, reptiles, amphibians, fish
* Invertebrates: Many invertebrates, including insects, crustaceans, cephalopods (like squid and octopus), and earthworms, have blood.
It's important to note that the composition and function of blood can vary significantly between different animal groups. For example, some invertebrates have hemolymph instead of blood, which is a fluid that mixes with their interstitial fluid.
Here are some examples:
* Mammals: Have red blood cells containing hemoglobin, which carries oxygen.
* Insects: Have hemolymph that contains hemocyanin, which carries oxygen, but it is not enclosed within cells.
* Earthworms: Have red blood cells containing hemoglobin, similar to mammals.
Therefore, the vast majority of animals, both vertebrates and many invertebrates, have some form of blood or a similar fluid that serves similar functions.