Fire ants, lacewing larvae, spiders, wasps, and many Hemipteran larvae are among those that have been reported to prey on immature monarchs (eggs, larvae, pupae). Parasitoid larvae then eat their prey from the inside out, usually emerging from the prey carcass as a pupa or adult.Click to see full answer. Beside this, what are the predators of monarch butterflies? More Monarch Predators List Assassin bugs feast on monarch caterpillars. Birds (Black-backed orioles and black-headed grosbeaks are common predators for butterflies overwintering in Mexico.) Chalcid Wasps (monarch chrysalis parasite) Lizards. Mice will eat chrysalides. Spined Soldier Bug- Predatory Stink Bugs. Toads. Additionally, what do monarch butterfly larvae eat? Monarchs cannot survive without milkweed; their caterpillars only eat milkweed plants (Asclepias spp.), and monarch butterflies need milkweed to lay their eggs. Then, do ladybugs eat butterfly eggs? Lady beetles or Ladybugs feed primarily on aphids. Ladybugs can be purchased in bags at some garden centers and released to do their jobs. But remember–they also eat butterfly eggs. Hover flies and wasps also eat aphids.How do you protect monarch caterpillars from predators?Lizards, frogs, wasps, and birds are among the predators that prey on caterpillars. If these predators occur in your area, and you discover caterpillars that you want to save, you have two options: 1. Move the caterpillars to host plants that are inside safe enclosures.