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8. Zombie Fungi
The idea of "zombies" actually existing in our world via some kind of apocalyptic event has long been dramatized in the world of popular media. No wonder! But the really scary truth of the matter is that there actually is a type of zombie "virus" among us right now! It attacks all sorts of insects and wildlife in many tropical jungles all over the world. Well, actually, it's not a zombie virus per se. It's actually a zombie fungus.

7. Kamikaze horsehair worm
For whatever reason, the idea of parasites and parasitic entities being worms just feels so fitting in certain ways. I mean, it makes sense. Mainly because it fits the idea and image of something “worming” its way into your mind and body and staying there without your permission. And we know that there are so many kinds of worms that exist in our world that are in fact really dangerous and should NOT be messed with. Especially when they can take over and control your body like the Kamikaze horsehair worm.

6. Sacculina Parasitic Castrator Barnacles
Barnacles aren't a creature you would normally expect to go and do things like… you know… take over the mind of an innocent creature for its own selfish and nefarious purpose. But in fact, that's what it can do in certain species like the Castrator Barnacles. And the way these barnacles go about achieving their goal is totally terrifying.

5. Green Banded Broodsac
Here is another example of a terrifying worm that is powerful enough to cause a creature to literally lose its own mind and be "augmented" to fit the parasite’s needs and do its bidding. The Green banded broodsac is a sinister type of Flatworm, one that has a penchant for infecting snails. The green banded broodsac begins its parasitic conquest by squirming its way into the stalks of the snail, basically the snail’s eyes, so that they swell up and look like juicy, pulsing, brightlycoloured caterpillars. That sounds confusing and plain tortuous. But this is only the beginning of the flatworm’s plan. Now that the snail is infected, it can be manipulated by the flatworm. Because you see, the worm can now control the snail and force it to put itself out there in terms of exposure. Exposure to what, you might ask. Exposure to birds and other predators.

4. Ladybird Wasp Parasite
While it may be called a "Lady", this wasp is anything but ladylike. It’s not only very clever in how it plots its takeover, but it is extremely manipulative and able to use other creatures to protect itself and its eggs.
You see, the ladybird wasp is actually smart enough to have a little bit of self awareness about its place on the food chain. It’s only a small insect, and it’s very susceptible to attacks from larger predators that want to eat it.

3. Emerald Cockroach Wasp
The emerald cockroach wasp has a metallic body that glows an eerie emerald with bright crimson markings on two of its legs. Found in the tropical regions of Asia, Africa and the Pacific islands, it is a beautiful insect, but pity the cockroach that crosses its path.
When it finds its target cockroach, despite the roach being at least 6 times the size of the tiny wasp, the wasp will use its unique sting on the cockroach and essentially totally paralyze it. Once the cockroach can't move at all, the wasp will move on to the next stage of the infection.

2. Toxoplasmosis
Parasites are very complex entities that use a wide range of terrifying tactics to go and get things done the way they want them done. Toxoplasmosis is no different. It's merely a single celled entity, but don’t let that fool you. Toxoplasmosis is famous for just how powerful its parasitic control is, and how it targets and infects rats and mice so that they'll purposefully get eaten by cats, and thus, Toxoplasmosis will be able to continue to spread and reproduce itself.

1. Rabies
And now, for the number one parasite that pretty much everyone knows about and knows to fear, Rabies. The reason that this particular entity is so bad is because it's technically not a parasite, but it definitely acts like one. It’s notorious because it can travel from animals to humans so easily and cause all sorts of wild behavioral issues.
It makes animals – usually dogs and bats, and occasionally humans – more aggressive, compelling them to spread the virus through biting and scratching.
This is why people are urged to be careful around wild dogs that they don't know, because if they carry rabies, there’s a very real possibility they will lash out and infect you!