In the Amazon a new species of parasitic wasp was found that transforms its victims into suicidal zombies.
The nightmare error turns the spiders into defenseless drones that leave their own colonies to fulfill the orders of the wasp.
The frightening discovery, made in Ecuador, was made by scientists from the University of British Columbia in Canada.
They say that the behavior of the wasp is a particularly "hard" form of kidnapping, which is when one animal manipulates another.
After leaving their homes, the spiders are made to spin a special cocoon for the larvae of the wasp that then hatch and eat the spider.
"The wasps that manipulate the behavior of spiders have been observed before, but not at such a complex level," said Philippe Fernández-Fournier, of the zoology department at the UBC.
"Not only is this wasp targeting a social species of spider, but it is making it leave its colony, which rarely does."
The parasitic wasp points to a spider named Anelosimus eximius, known for living in large colonies and cooperating with others to capture prey and raise their young.
The researchers noted that some of the spiders were infected with a parasitic larva and were seen moving away from their colonies to weave closed fabrics.
"It was very strange because they usually do not do that, so I started taking notes," said Fernández-Fournier.
It was then that the surprised scientists noticed that the larvae belonged to an unknown species of Zatypota wasp.
"These wasps have an elegant and elegant appearance," said Samantha Straus, co-author of the study and a doctoral student in the zoology department at OBC. "But then they do the most brutal thing."
A female wasp first puts an egg in the abdomen of a spider that then breaks and begins to feed on the spider.
Then, the spider leaves its colony and creates a cocoon for the larva, before waiting to be devoured by the young of the wasp.
"This behavior modification is so serious," said Straus.
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"The wasp completely hijacks the behavior and brain of the spider and causes it to do something it would never do, such as leaving its nest and spinning a completely different structure.
"That's very dangerous for these little spiders."
It is not known how the wasps do this, but scientists believe that it may be caused by an injection of hormones that make the spider think that it is at a different stage of life or that it is dispersed from the colony
"We believe that wasps target these social spiders because it provides a large colony of stable host and a source of food," said Straus.
"We also discovered that the larger the spider colony is, the more likely it is that these wasps will target it."