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I don't mean cannibalism within a single species - I mean, are they are any pairs of species A and B such that members of species A regularly prey on members of species B, and also members of species B regularly prey on members of species A? I'm considering adults preying on other adults of the other species, not on individuals early in their life cycle.

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  • Caiman and Anacondas - though each hunts the other at a stage of development when the hunter is larger.1 2
  • Occasionally this occurs with Orcas and Sharks.3
  • Some species of shark3
  • Spiders and mantids4
  • Alligators and catfish (catfish prey on infant alligators)
  • Many species of predatory fish
  • Some species of constrictor and venomous snake.
  • Some frogs and Epomis circumscriptus / Epomis dejeani5
  • Some amphipods6
  • In Antiquity, hominids and lions7 8
  • Big cats preying on eachother, among other large predators:

Carnivores eat a variety of vertebrates: e.g. desert coyotes eat … carnivores (roadrunners, reptiles, and mammals)… Carnivorous mammals often overlap substantially in diet (30). Many “readily prey on other carnivores” (125), e.g. tigers prey on bears (black, brown, and sloth bears), dogs, wolves, lynx, and badgers (125): leopards prey on lions, cheetahs, wild dogs, and spotted hyenas (also raptors, crocodiles, and pythons; …

Leopards are mutual predators with lions, spotted hyenas, tigers, large raptorial birds, crocodiles, and pythons…

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A python will eat an alligator:

enter image description here

Source: http://www.miamibeach411.com/news/python-snakes

and an alligator will eat a python:

enter image description here

Source: https://www.palmbeachpost.com/news/gator-chows-down-python-florida-golf-course/9HUGKYz7j3qF1BGJwc2RUL/

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