Excluding humans of course. I have seen snakes do it, but that’s about it. And are there any species that will do it even if there are other food choices?
There are certainly other species that will cannabalize. For instance, I know that mice and many other rodents will cannabalize their own young. I’m unsure if hunger is a potential cause or not.
I’m sure we’re all familiar also with certain insects that devour their mates. This isn’t the result of hunger, per se. However, it does provide them with valuable proteins and nutriets for their young, so I’m not sure if that counts or not.
Pretty much any carnivorous or omnivorous animal will resort to cannibalism if hungry. “Hungry enough” doesn’t even figure into it for most animals; they have no particular compunction against eating conspecifics. The reason carnivores or omnivores don’t eat each other more often has more to do with the fact that they are more difficult to tackle and subdue than their regular prey than any aversion about it.
In any case, the aversion to cannibalism found in humans is purely cultural rather than innate. Some cultures had no problem with it at all.
A lot of the caveman era skeletons anthropologists are uncovering show signs of being noshed on before being buried.
Amazing how human culture evolves. Now, we have the nosh after the funeral.
My sister raised chickens in the backyard when we were teenagers and I can confirm that chickens will happily chow down on chicken. We threw any and all food scraps into a bin (as opposed ot the garbage or disposal) and they got fed to the birdies. Bits of chicken meat, fat, eggshells and other stuff were all on the menu.
Saw a nature documentary the other night in which alligators were eating each other. (Big ones eating little ones.) (Or was it crocodiles?)
Also a type of ape did it. Gory.