This not-so-adorable parasite depends on the fish's tongue as its food source. It eventually replaces the tongue completely.
The ladybug serves as the host for a parasitic wasp who lays its eggs inside the ladybug's body. The larvae use the host's body as food and shelter while it matures.
The Lazy Wasp Larva uses a spider as host for its maturing larva. It even makes its victim spin a cocoon to house it and protect it as it grows.
The Toxoplasma gondii is a parasite that is found in cat excrement. Once it enters the food chain through a creature that eats the droppings, it lives off the brain tissue of the host. As it moves up the food chain, it can even land in the brain of humans.
This fungal parasite matures in the brain of ants, even using the body as a method of moving around and spreading itself through the environment. When it moves on, the body of the ant is left to be used by other organisms, such as other fungi or plants.
This shrimp-like creature is the victim of a parasite that invades its brain, eventually taking over and forcing the deep-dwelling creature toward the light at the surface.
The indestructible cockroach can fall victim to this parasitic wasp. The jewel wasp lays its eggs, against the will of the cockroach, inside the roach's body. The young use the cockroach as their womb, literally eating their way out when they mature.
The parasitic Apocephalus borealis hitches a ride on the abdomen of the bee, The eggs it lays there use the bee's body as their food source, eating their way out as the bee goes about its business.
This parasite uses the body of the cricket as its incubator. It eventually takes control of the cricket's brain, forcing it to commit suicide by throwing itself into a body of water. Once in the water, the hairworm moves on.
This parasite forces its way into the crab's bloodstream, using its brain like a Zombie. It grows inside the crab, taking over its thought processes. The crab eventually dies as the parasite takes over more and more body functions.
This Zombie-like parasite is actually a flat worm that embeds itself in the tentacle stalks of the amber snail. The colorful parasite dresses up the snail, hoping to attract a hungry bird. The poor snail ends up being eaten by the bird as a way to spread the eggs of the unwelcome parasite.
This horrific scene is courtesy of a parasitic virus. This gypsy moth is a victim of the baculovirus. The end result is a monstrous demon bug.
The colorful tit bird looks harmless but is really on the prowl for its fellow birds. The tit bird sees other birds as a source of food, attacking and slaughtering them.