Images or animations that depict two or more different species who in real-life would be the predator or prey of the other(s). Note that this label, by itself, doesn't imply anything about the kind of interactions: characters could act angry, happy, naughty, scared, romantic, et cetera.
In most cases, the predator species is usually a carnivore, meaning an animal who only consumes other animals. Yet pictures often depict an omnivores, which is an animal who can consume both other animals and plants. The prey can be almost any species. Many carnivores and omnivores are 'apex predators' that turn into prey different animals that would otherwise do the hunting, a direct example is foxes seeking out birds that themselves hunt fish.
Tag with role_reversal too if the would-be prey character is dominant and the predator is submissive.
Partial list of Carnivorous Species
Partial List of Omnivorous Species
forum #186154 - predator/prey relations and interspecies implication (Mar. 2016)