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Bees, hornets and wasps are for the most part a very beneficial group of insects, being the major pollinators of flowering plants, helping to reduce the numbers of many insect pest species, etc.
With the onset of cold weather, workers, and males die off leaving the inseminated queens to find a suitable place for the winter. They then start a new colony in the spring.
In the spring, they use chewed plant material and saliva to build their nests. A bee can only sting one time and then it will die. However, wasps and hornets are more aggressive and have smooth stingers, so they can sting over and over again. They are very protective of their nests and colonies and will attack anyone that invades their space. Their sting not only caries venom that makes the sting very painful, but they also inject a pheromone that alerts the rest of the colony to let them know where the intruder is, so they can find them and also attack them applying multiple stings.
Honey bees are the exception where the entire colony finds a suitable place for the winter. These suitable places can be either in the ground or in buildings, such as houses, garages, attics, sheds, under or in shrubs, and bushes. Honey Bees are essential for the environment.
These are Hornets Nests Hidden...be careful!! Don't run lawn mowers near it , throw rocks at it, or try to spray it down with water, once you get stung a pheromone is given off and you will be attacked by the whole colony!!