It's actually relatively common in the animal kingdom for cannibalism to exist. I'm not sure about birds, but spiders, octopus, pigs, mice, hamsters, rabbits, rats, and chimpanzees... although some of these only happen in captivity, not in the wild.
In most cases -- humans included -- it's generally not done unless there's no other food source.
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In most cases -- humans included -- it's generally not done unless there's no other food source.
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