Opossums (Mammalia: Didelphidae) in the diets of Neotropical pitvipers (Serpentes: Crotalinae): Evidence for alternative coevolutionary outcomes?

► I review published and unpublished records of pitviper predation on opossums. ► Many opossums are eaten by pitvipers, including some species that are venom-resistant. ► Venom-resistant opossums are already known to prey on pitvipers, so. ► These observations suggest coevolutionary role-switching between victims and exploiters.