In all likelihood, the most significant of these is a heightened chance of acquiring harmful parasites or diseases from a conspecific. Both parasites and pathogens are often species-specific and many of them have evolved mechanisms to defeat their host’s immune defenses. As a result, predators that consume their own kind run a greater risk of picking up a disease or a parasite than do predators that feed solely on other species.
-Bill Schutt
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