Often mistaken for honeybees, Yellowjackets are brighter in color, with a thinner, more defined waist. Yellowjacket attacks can be deadly for people who are allergic to their stings. Yellowjackets are more aggressive than other stinging insects such as wasps, hornets, mud daubers or bees. They can both sting and bite. They will often bite to get a better grip to jab their stinger in. Yellowjackets vigorously defend their nests. Swarm attacks can occur when someone accidentally steps in or hits a nest opening. Ground vibrations can also trigger attacks from underground nests — Thus, mowing lawns can be hazardous during the late summer season when colonies are large. Hope this helps, let us know if you have any questions!