What do a deer, a dolphin, a squirrel, and… a dinosaur have in common? The boring answer is they’ve all lived on this planet at a certain point in time. What’s even more surprising about their common features is their coloration! There's a theory that says that animals are “painted” by nature so that the parts that get the most light from the sky are the darkest, and vice versa. So, why is blue so rare among animal colors?

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