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... Species with lots of predators canít expect to escape being eaten for more than a few years. So they evolve to reproduce as quickly as possible, and in large numbers. This takes a lot of metabolic resources out of the adults, and they are more likely to die shortly after breeding. Even more importantly, genetic mutations that might cause disability or disease later in life donít have any effect on natural selection because those individuals have already reproduced. This means mutations of this sort tend to accumulate in the species, and so its maximum natural lifespan will tend to shorten.