Thyrinteina leucocerae, the caterpillar of the geometer moth, is targeted as a host for a species of parasitoid wasp that can lay up to 80 eggs inside its body. The caterpillar’s reward is a job as bodyguard for the very parasites growing inside it and a slow, agonizing death.

The Glyptapanteles wasp is one of nature’s most fascinating and, at the same time, terrifying body-snatchers. Not only does its lay dozens of eggs into caterpillar hosts, but scientists claim that the insect can somehow change the behavior of the host, turning into a mindless bodyguard whose only mission is to protect the wasp’s eggs against predators. Once the wasp grubs hatch out of its body and begin to spin their pupae, the caterpillar stops moving, stops eating, gets on its hind legs and goes into statue mode. But at the slightest threat for the wasp “babies”, it starts swinging its head violently to drive predators away.

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As if habitat loss and pesticide exposure weren’t enough to deal with for bumble bees, they also face increasing pressure from a parasitic fly that attacks them midair, injects them with eggs with hatch larvae which proceed to eat the pollinators from the inside before finally forcing them to dig their own graves.

It sounds like something out of a body snatchers horror movie, but the conopid fly is very much a real-life threat for bumble bee colonies already under a lot of pressure from human activities. The conopid fly is classified as a parasitoid, a parasite that not only feeds on its host, but ends up killing it in a gruesome, terrifying way. We’ve featured creepy body snatchers in the past, some that turn their host into zombies, others that simply take control of their bodies but leave their brains intact, but the conopid fly is even worse. It literally eats bumble bees from the inside, before somehow forcing them to land on the ground and dig a whole to die in. The injected parasite grows inside the host and ultimately bursts out of it as a mature conopid fly that attacks other bumble bees and continues this nightmarish cycle.

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