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the ages, serving as deities , religious symbols, and as the subjects of art, books and movies. tetrapods emerged within lobe-finned fishes , so cladistically they are fish as well. however, traditionally fish are rendered paraphyletic by excluding the tetrapods (i.e., the amphibians , reptiles , birds
known to have blue colouring because of cellular pigment. [ ] the term "fish" most precisely describes any non- tetrapod craniate (i.e. an animal with a skull and in most cases a backbone) that has gills throughout life and whose limbs, if any, are in the shape of fins. [ ] unlike groupings such as birds...
https://en.wikipedia.org/wiki/Fish