What Do Yellowjackets Eat?

Yellowjackets are aggressive insect predators. They actively hunt flies, mosquitoes, gnats, and other small flying insects. A single yellowjacket can capture and kill many insects in a single day. They also hunt spiders, caterpillars, and various other arthropods. Yellowjackets use their strong jaws and speed to overpower prey. They can land on an insect, kill it quickly, and carry it back to the nest. The primary purpose of hunting is feeding their larvae. Learn about yellowjackets and their hunting strategies. Yellowjackets bring killed insects back to the nest where the larvae eat the protein-rich food. Adult yellowjackets mainly eat the saliva and other secretions from the larvae, which contain sugars. This creates a symbiotic feeding relationship within the colony. Without access to larvae, adult yellowjackets must find other protein sources. In late summer when the colony is winding down and larvae are developing into adults, food competition increases. Yellowjackets become more aggressive and desperate in their hunting. They will eat dead insects, carrion, and even attack other insects' nests to steal food.

Yellowjacket diet shifts dramatically through the seasons based on colony lifecycle and available food. In spring, a new queen starts a small nest and hunts insects to feed her first larvae. The queen does all the hunting herself initially. As the colony grows through summer, more workers hatch and help with hunting. Summer is when yellowjackets are most aggressive hunters, capturing large quantities of insects to feed the rapidly expanding colony. In late summer and early fall, the colony reaches peak population. Workers become more aggressive and predatory as they hunt to feed thousands of larvae. This is when yellowjackets are most likely to bother humans at outdoor food sources. As fall progresses and colonies begin to die down, male yellowjackets and new females emerge. These do not hunt insects. Instead, they focus entirely on finding sugary foods to build energy reserves. By late fall, most yellowjackets have died, and the mated females find shelter to survive winter. In winter, surviving queens become dormant and eat nothing until spring arrives.

While yellowjackets are active hunters, they are also eager scavengers. They seek out human food sources including picnics, trash cans, outdoor garbage, and food left on plates or grills. Yellowjackets are attracted to sugary foods like soda, juice, ripe fruit, and jams. They also scavenge protein sources including meat, fish, and pet food. At a picnic, yellowjackets may approach meat, fish, cheese, and sweet drinks. They will bite off small pieces and carry them back to their nest. Garbage cans attract large numbers of yellowjackets, especially in summer. Fermented or rotting fruit is particularly attractive to them. Fallen fruit under trees draws yellowjackets from considerable distances. They consume the fermenting sugars in the fruit and may become aggressive to anything near their feeding source. Hornets' nests and other wasps' nests sometimes contain food sources that yellowjackets attempt to raid. They will attack other colonies to steal food and brood. In late summer and fall, this scavenging behavior intensifies as workers focus on gathering sugary substances to feed the adults preparing for winter.

Yellowjackets are complex hunters with specific tactics for capturing prey. They use their large compound eyes to spot moving insects from considerable distances. Once prey is located, yellowjackets make rapid aerial attacks with impressive maneuverability. They can hover, dart side to side, and reverse direction instantly. Their speed and agility make them effective predators of flying insects. When attacking, a yellowjacket approaches from behind or below the prey to minimize the risk of counterattack. Once on the prey, the yellowjacket uses its strong mandibles to subdue and kill the insect quickly. Understand more about predatory insect behavior by reading our wildlife resource. Unlike bees, yellowjackets can sting multiple times without dying. This makes them dangerous hunters and defenders. After killing prey, the yellowjacket may immediately begin processing the insect. It removes wings, legs, and other inedible parts. The remaining protein-rich body is chewed into a ball and carried back to the nest. Yellowjackets will hunt throughout the day and into evening hours. They are visual hunters and primarily active during daylight, unlike many nocturnal insects.

Yellowjacket larvae are entirely dependent on worker wasps for food. Worker wasps capture insects and bring them to the nest to feed developing larvae. Each larva consumes many insects as it grows from egg to adult. The larvae produce secretions that contain sugars and proteins that adult yellowjackets consume. This is the primary food source for adult yellowjackets, second only to direct nectar feeding. Larvae grow rapidly when fed consistently with insect prey. A well-fed larva develops into a healthy adult wasp. Poorly fed larvae may die or develop into weak adults. The availability of insects directly impacts the success of the colony. In times of insect scarcity, the colony may struggle to feed all larvae. Workers spend more time hunting and become more aggressive at food sources. Late in the colony's development, larvae consume less food as they prepare to pupate. Eventually they transform into adult wasps. Once wasps emerge from pupae, they immediately become workers and help feed the remaining larvae. This creates a feedback loop where more workers equals more hunting capability and more food for larvae.

Yellowjackets pose problems because they actively seek out human food sources. They are attracted to outdoor dining, trash cans, fallen fruit, and beverage containers. To keep yellowjackets away from your food, cover dishes and drinks, keep trash cans sealed tightly, and clean up food scraps promptly. Do not leave pet food outdoors for extended periods. Bring pet food inside after feeding. Yellowjackets will readily consume pet food and return repeatedly to the same source. If you find a yellowjacket nest, do not attempt to destroy it yourself. Yellowjackets will aggressively defend their nest. Contact a professional pest control service to safely remove nests. Cover trash cans and composting areas as much as possible. Ripe fruit on trees attracts yellowjackets, so pick fruit promptly. Fallen fruit should be removed or buried deeply. Do not swat at yellowjackets near food sources, as this may prompt them to sting in defense. Instead, move slowly away and give them space. In late summer and fall, yellowjackets become increasingly aggressive. Be especially cautious when eating or drinking outdoors during peak season. Consider eating indoors when yellowjacket activity is highest. Learn more from wildlife about managing these encounters. For additional resources, visit wildlife to understand wasp behavior and prevention strategies better.

Yellowjackets differ from many other wasps and bees in their feeding habits. Honey bees are herbivorous, feeding on nectar and pollen exclusively. They do not hunt insects like yellowjackets do. Bumblebees also focus on nectar and pollen but may consume some insects. Paper wasps are hunters but generally less aggressive than yellowjackets. Paper wasps hunt spider eggs and caterpillars rather than flying insects. Mud daubers are solitary wasps that hunt specific spiders and paralyze them for their larvae. They do not form aggressive colonies like yellowjackets. Hornets are closely related to yellowjackets but are generally less interested in human food sources. Hornets focus more on hunting insects and less on scavenging. Dragonflies are also insect predators but hunt much larger flying insects than yellowjackets can capture. The main difference is that yellowjackets aggressively exploit human environments and food sources. Most other wasps avoid humans and human food. This makes yellowjackets unique among wasps in their willingness to directly compete with humans for food. Their success in human-dominated environments has made them widespread and commonly encountered.