Cannibal Animals - Do they exist?

I don't know about any naturally-occurring cannibals though I'd venture to guess that there are some, and that the majority of species would regardless if they were starving. As far as dying from it, that makes no sense. Two members of the same species are made up of the same basic molecules, proteins, amino acids, etc....there'd be no reason it'd be harmful for them--unless, for example, part of the animal (a scorpion, say) was venomous and the animal ate the venom.