"Presumably they're poorly equipped to hunt other animals, including their own species, so it's an evolutionary question as to why cannibalism still exists among non-carnivorous animals, " he said.

BBC: Cannibal fruit flies: Lab maggots hunt one another

It is not a pretty, or terribly edifying sight, whether for farmers, carnivorous consumers, politicians or those who care about animals.

ECONOMIST: They’re burning animals again | The