Enlarge the 'image Giant hornets attack a hive not protected by droppings. Heather Mattila In the United States, we were quite panicked by the killing of hornets, but these invasive giant Asian hornets also pose a threat problem for bees. In Vietnam, some bees have discovered a powerful defense against the dangerous predator: animal droppings. A study conducted in Vietnam by researchers at the University of Guelph in Canada documented for the first use of tools by bees. The tool just happens to be poop with a purpose. It turns out that the dung deters the giant hornets from invading bee hives. Science From the lab to your inbox. Receive the latest science stories each week. The team published its results in the journal PLOS One on Wednesday . Our study describes a remarkable weapon in the already sophisticated portfolio of defenses that honey bees have developed in response to the predatory threats they face, the newspaper said. The murderous hornets are known to have organized coordinated attacks on the beehives ofHoneybees where they kill adult residents and take young bees for food. Larger image A honey bee in Vietnam is holding a piece of dung with its mouthparts. Heather Mattila Researchers documented how Vietnamese bees collected droppings and arranged them around entrances to their hives. In one experiment, researchers found that bees preferred to collect extremely smelly droppings from pigs and chickens when given the chance. The hornets spent less than half the time at the entrances to the nest with spotss of manure moderate to heavy than in hives with few spots, and they spent only a tenth of the time chewing at the hive entries to get to the bee brood, the university said in a Wednesday statement . The team considers this behavior to be use of tools because it involves the use of an object in the environment for a specific purpose, and the bees shape the dung with their mouths. Why does dung work to ward off hornets? question. The scent can act as a repellant, or it can mask bee scents that attract hornets. News from the hornet about the murder First murderous hornet nest found in the United StatesUnited destroyed by the void; other nests may exist Murder hornets munchies: Horrible insect makes a delicious treat M Black hornets are of particular concern in North America because of the threat they pose to populations bees. Honey bees in Canada and the United States may not have the same tool-using abilities as their cousins in Vietnam. They haven't had the chance to evolve the defenses. It's like entering a cold war, said lead author Heather Mattila . Washington State Authorities destroys nest of deadly hornets in October, but there could be more. Hornets pose a clear threat to bees, but also a concern for humans . Says study co-author Gard Otis , I was stung by one and it was the most excruciating sting of my life.