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In a thousand years, if the Piranha has not yet faced extinction, then its most noticeable feature would be the dullness of its once sharp teeth. Piranhas rely on the small animals such as insects or worms for nutrients that fall into the water where they can easily consume them. At the rate the rainforest is being cut down and replaced, along with global warming, those small mammal’s habitats will be destroyed causing them to go extinct. In turn, this will lead to piranhas having to feast on plants in the water, causing a shift from being once carnivore to an omnivore.