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One of Biology's key themes is that form, or body structure, in living things fits each one's function. This helps explain the "beauty," or adaptive success, of so-called "ugly" animals in nature. If we see ugly animals in light of how well they have adapted to their niches or environments, we appreciate how “deformity” gives each a better fitness for survival. Watch the parade of diverse adaptations in mammals, birds, reptiles, and fish that defy our preconceptions of ugliness.