Yellow jackets are commonly mistaken for bees, but they actually belong to the wasp family. They are known for their bright yellow and black striped coloring, which serves as a warning sign to predators that they are armed with a potent sting. Yellow jackets are social insects and live in large colonies, often found nesting in the ground, in tree cavities, or in man-made structures.

The physical appearance of yellow jackets can vary slightly depending on the species and their geographical location. On average, they are about half an inch to three-quarters of an inch in length and have slender bodies with a defined waist. Their wings are translucent and their heads are a darker shade of black than their bodies. They have large compound eyes that are positioned on the sides of their heads and can rotate to help them track their prey.

Yellow jackets also have a unique feature that distinguishes them from other wasp species: a smooth stinger. Unlike the barbed stinger of a honey bee, a yellow jacket’s stinger can be pulled out and reused, making them capable of stinging their victim multiple times.

Physical Description

Size and Shape

Yellow jackets are a type of wasp that have a reputation for being aggressive. They typically range in size from 10-15mm in length, with a wingspan of 12-16mm. They are shorter and thicker than bees, with a rounder body shape. Their heads are typically black, with yellow markings on their thorax and abdomen.

Coloring

Yellow jackets get their name from the bold yellow stripes on their body. They have black and yellow bands on their abdomen. The yellow can range from pale or almost white to vivid and bright. Some species have a more muted coloring, with brown or rust-colored bands on a black background.

Markings and Patterns

Each yellow jacket has its own unique markings, although some species have more distinctive patterns than others. Some yellow jackets have additional black markings on their faces or legs, while others have unique patches of yellow or black on their bodies.

Other Features

Yellow jackets have a stinger, which can be used to defend themselves or their nests. Their wings are translucent and can fold over their bodies when at rest. They also have strong mandibles, which they use to capture prey and defend their nests.

Coloration and Markings

Yellow and Black Stripes

One of the most distinctive features of a yellow jacket is its yellow and black striped body. The black stripes, which run horizontally across the yellow abdomen, are thicker than the yellow stripes. This coloration helps to identify yellow jackets and separates them from other wasp species.

Facial Markings

Yellow jackets also have unique facial markings that distinguish them from other wasp species. They have black dots on their face that resemble eyebrows, and their mandibles are usually black or brown. These markings are helpful for identifying yellow jackets up close.

Size and Shape

Yellow jackets are relatively small wasps, measuring about 10-16 mm in length. They have a slender waist and a tapered abdomen that helps to give them a sleek, aerodynamic appearance. Their bodies are also covered in fine hairs, which can be difficult to see without magnification.

Variations in Coloration

While most yellow jackets have black and yellow stripes, there are some species that have different colorations. For example, the bald-faced hornet has a black body with white markings on its face and abdomen. Some yellow jackets may also have additional red or orange markings on their bodies.

Overall, the coloration and markings of yellow jackets are highly distinctive and can be used to identify them from other wasp species. If you encounter a yellow jacket, it is important to note its markings and coloration so that you can properly identify it and take appropriate measures to avoid getting stung.

Size and Shape

Yellow Jacket Size

Yellow jackets are medium-sized wasps, measuring between 10-16mm in length. Queens tend to be larger than males and workers, measuring up to 19mm in length.

Despite their relatively small size, yellow jackets are dangerous pests. They are known for their aggressive behavior and painful stings, which can be life-threatening for people who are allergic to their venom.

Yellow Jacket Shape

Yellow jackets have a distinctive shape, with a slender waist and a tapered abdomen. Their bodies are black with yellow markings, which is how they earned their name. Their wings are also yellowish-white in color.

Yellow jackets are often confused with bees due to their similar coloration, but they have a smoother, less hairy body and a longer, more slender shape. They also lack the rounded, flattened legs that bees have.

Their elongated shape makes them well-suited for their preferred habitats, such as underground burrows and tree hollows. This allows them to easily navigate narrow spaces and to expand their nests as needed.

Behavioral Characteristics

Aggressiveness

Yellow jackets are known for their aggressive behavior, especially when their nests are disturbed. They will often attack in large numbers, stinging their victim repeatedly. Unlike bees, yellow jackets can sting multiple times and do not die after stinging.

Foraging

Yellow jackets are scavengers and can be found foraging for food in garbage cans, picnics, and outdoor eating areas. They are attracted to sweet and sugary foods, as well as meat and other protein-rich foods. Yellow jackets are more active during the day and will often swarm around food sources.

Nest-Building

Yellow jackets build nests in the ground or in hollow cavities such as tree stumps, attics, or wall voids. The nests can range in size from a few inches to several feet. Yellow jackets are very protective of their nests and will defend them aggressively if they feel threatened.

Social Structure

Yellow jackets are social insects and live in colonies with a queen, workers, and males. The queen is responsible for laying eggs, while the workers forage for food and build the nest. Males are only present during mating season and die shortly after mating. Yellow jacket colonies can contain thousands of individuals.

Communication

Yellow jackets use chemical signals to communicate with each other. They release pheromones that indicate food sources, danger, or the location of the nest. The workers will also release an alarm pheromone if they feel threatened, which signals others to attack.

Yellow Jacket vs. Bee Characteristics

	Yellow Jacket	Bee
Aggressiveness	Very Aggressive	Moderate
Stinger	Can sting multiple times	Can only sting once and die after
Foraging	Scavengers for sweet/sugary foods and meat	Collect nectar and pollen from flowers
Nest-Building	Build nests in the ground or in cavities	Build nests in trees or man-made structures
Social Structure	Live in large colonies with queen, workers, and males	Live in smaller colonies with queen and workers

Foraging Habits

Yellow Jacket Food Preferences

Yellow jackets are omnivores, which means they eat both plants and animals. They are especially fond of sweet foods like fruit, nectar, and honey. They are also known to eat other insects, including caterpillars and flies. During the late summer and early fall, yellow jackets become more aggressive in their search for food, as they try to store up enough energy to survive the winter.

Yellow Jacket Hunting Techniques

Yellow jackets are skilled hunters and will often work together to capture their prey. For example, when hunting for flying insects like flies or bees, one yellow jacket will chase and distract the target while another yellow jacket swoops in for the kill. Yellow jackets will also hunt for insects on the ground, using their sharp senses to detect the vibrations of nearby prey.

Yellow Jacket Raids

Yellow jackets are known to raid outdoor food and drink sources, such as picnics, barbecues, and trash cans. They are attracted to sweet and sugary foods and will aggressively defend their food source if threatened. If you are planning an outdoor event, be sure to take measures to discourage yellow jackets from invading, such as covering food and drinks with lids or keeping them indoors.

Quick Facts about Yellow Jackets

Lifespan:	3-4 months (workers), 1 year (queens)
Size:	1/2 – 3/4 inch long (workers), up to 1 inch long (queens)
Habitat:	Nests built in underground cavities, tree cavities, and sometimes in buildings

Nesting Habits

Solitary Yellow Jackets

Some species of yellow jackets nest alone and do not form large colonies. These solitary yellow jackets build their nests in soil or hollowed-out wood, often taking advantage of pre-existing holes or burrows. They tend to be less aggressive than their social counterparts and rarely sting unless provoked.

Social Yellow Jackets

Social yellow jackets build large, papery nests in trees, bushes, or on the sides of buildings. These nests can house thousands of individuals and are typically home to a single queen. The nests often have a distinctive circular shape, with a small entrance hole near the bottom.

Social yellow jackets are known for their aggressive behavior and will sting repeatedly if they feel their nest is threatened. They can become a pest in areas where people gather, like outdoor events and picnic areas, and may need to be professionally removed if they pose a danger.

Nesting Season

Yellow jackets typically begin to build their nests in the spring, with activity increasing throughout the summer and early fall. The queen will lay her first batch of eggs in the nest and tend to them until they hatch into worker yellow jackets. As the season progresses, the number of workers increases, as does the size of the nest.

By late summer, the queen will begin to produce male and female reproductive yellow jackets, which will eventually leave the nest and mate. The new queens will then find a place to overwinter and start their own colonies the following spring, while the old queen and the remaining yellow jackets will die off as winter sets in.

Yellow Jacket Life Cycle

Queen and Eggs

The life cycle of a yellow jacket begins with a queen who emerges from hibernation in the spring. She will build a nest and lay up to 50 eggs. The eggs will hatch into larvae within a few days.

Larvae and Pupation

The larvae will be cared for and fed by the queen until they pupate and become adults. The pupation process takes about 3 weeks.

Workers and Nest Building

Once the adults emerge, they are sterile female workers who take over the duties of caring for the queen and the rest of the nest. They will also begin building and expanding the nest.

Mating and Colony Expansion

Later in the summer, the queen will begin to lay eggs that will hatch into males and fertile female queens. The males will mate with the queens and then die. The new queens will leave the nest and find a place to hibernate for the winter. The original queen and workers in the nest will continue to expand the colony until the fall.

Decline and Winter

As fall sets in, the colony will begin to decline and the remaining workers will die. The original queen will also die, leaving behind the new queens who will survive to hibernate and start new colonies in the following spring.

Identification Tips

Color

One of the easiest ways to identify a yellow jacket is by its color. As the name suggests, these wasps have a bright yellow and black striped pattern on their abdomen. Their head and thorax are typically black, although some species may have hints of yellow or white on their faces.

Size

Yellow jackets are typically between 10-16 mm in length, which is roughly the same size as a honey bee. However, they have a more slender and elongated body shape than a bee, with a narrow waist and longer legs.

Behavior

Another way to identify yellow jackets is by their behavior. These wasps are often seen flying in a very fast, erratic pattern, and they can be quite aggressive if they feel threatened. Additionally, unlike bees, yellow jackets have a smooth stinger, which means they can sting multiple times without dying.

Nests

Yellow jackets typically build their nests underground, in hollow trees, or in other protected areas. Their nests are made from paper-like material, which is created from wood fibers that are chewed up and mixed with saliva. If you suspect you have a yellow jacket nest on your property, it’s best to contact a pest control professional for removal.

Precautions and Safety Measures

Wear Protective Clothing

When dealing with yellow jackets, it’s important to wear protective clothing to avoid getting stung. Make sure to wear long sleeves and pants, as well as sturdy shoes or boots. Additionally, you should wear gloves and a hat with a veil to protect your face and neck.

Avoid Disturbing the Nest

Yellow jackets are aggressive and will attack if they feel threatened. Do not attempt to remove a yellow jacket nest on your own unless you are a trained professional. If you do need to be in the vicinity of a nest, move carefully and slowly to avoid disturbing the insects.

Use Insect Repellent

If you are going to be spending time outdoors in an area where yellow jackets are common, consider using an insect repellent. Be sure to read and follow the instructions on the label carefully, and reapply as needed. Keep in mind that insect repellents are not 100% effective and cannot guarantee that you won’t get stung.

Be Prepared for an Emergency

If you or someone else is stung by a yellow jacket and experiences an allergic reaction, seek medical attention immediately. Keep an epinephrine auto-injector on hand if you have a known allergy. It’s also a good idea to have a first aid kit with you when you are outdoors.

Call in the Professionals

If you have a yellow jacket nest on your property, it’s best to call in a professional exterminator to remove it. Attempting to remove the nest on your own can be dangerous and may not be effective. A professional will have the proper equipment and training to safely and effectively remove the nest.