The yellowjacket, also known as the yellow jacket, is a species of predatorial social wasps belonging to the genus Vespula and Dolichovespula. They are most often referred to simply as wasps. The majority of these, such as the eastern yellowjacket Vespula maculifrons and the aerial yellowjacket Dolichovespula Arenaria, are black and yellow. Others may have a red abdomen background color instead of black. Yellowjackets are fast fliers with a distinctive, rapid side-to-side flight pattern approaching the ground. All females can sting. Yellowjackets are key pest insect predators.

The Bald Faced Hornet (scientifically known as Dolichovespula maculata) is a species of wasp in the genus Dolichovespula and a member of the cosmopolitan (The term "cosmopolitan" refers to something that may be found almost everywhere on Earth.) Vespidae family, which are also eusocial. A variety knows the bald-faced hornet of names, including bald-faced aerial yellowjacket, bald-faced wasp, bald hornet, white-faced hornet, black jacket, white-tailed hornet, bull wasp, and spruce wasp. It is not one of the actual true hornets in the genus Vespa. It's a species of yellowjacket wasp. Dolichovespula colonies contain 400 to 700 individuals, which is the largest known colony size in the species. It constructs a substantial hanging paper nest up to 58 cm (23 in) long and is notable for doing so. You do not want to upset this species, as invaders are vigorously fought by workers who sting repeatedly.

The European hornet is a eusocial wasp native to Europe. (Insects that cooperate to raise their young are said to be eusocial. This advanced level of social organization means a single female or caste produces the offspring and other non-reproductive individuals help care for them.) The European hornet is also the only genuine hornet found in North America, having been brought by European immigrants in the 1800s. Workers can reach up to an inch (25 mm) long, while queens are somewhat larger and reach 1.3 inches (35 mm).

The Black Carpenter Ants are the most common in the Baltimore region. These large, black ants may become a problem for your home. They don't eat wood like termites but construct nests in wet or moist wood. They do this by removing all of the wood they can to open up an area to live. Once a carpenter ant nest is built in wet wood, it may be extended into healthy, dry wood. Tunneling can cause significant structural damage if it occurs in major structural wood. The presence of a carpenter ant colony inside the building is usually a substantial indication of a water leak somewhere.

The most typical 1/4 to 1/2 inch long and workers are frequently encountered by homeowners. Winged queens and males may be seen in the spring or early summer. These newly emerged reproductive forms are more noticeable than the workers and are the biggest ants in Maryland (up to 3/4 inch).

The pharaoh ant (Monomorium pharaonis) is a small (2 mm) yellow or light brown ant. This ant is almost transparent and notorious for being a major indoor nuisance pest in Baltimore. The Pharaoh ant is polygynous. Polygynous implies that there are many queens in each colony, which leads to distinct caste interactions and colony dynamics. This also allows the colony to break up into bud colonies very rapidly.

Acrobat ants, also known as Crematogaster, are a worldwide ecologically diverse genus of ants with a distinctive heart-shaped abdomen that gives them one of their popular names, the Saint Valentine ant. When startled, these ants will raise their abdomens.

The name "roof rat" comes from its inclination to seek refuge in the upper portions of structures such as attics of homes. Unfortunately, roof rats gnaw through materials within and spread disease via contamination of stored food and as vectors of deadly illnesses.

It is also known as a house rat or ship rat and is a Murinae subfamily rodent belonging to the common long-tailed rats of the Rattus genus. It probably originated in the Indian subcontinent, but roof rats are now found worldwide. The black rat has a lighter underside that is black to light brown.

The brown rat also has many other names such as the sewer rat, street rat, wharf rat, Norway rat, Norwegian rat, Hanover rat, or Parisian rat and is a widespread type of common rat. It is a brown or grey rat with a head and body length of up to 28 cm and a tail slightly shorter.

The deer mouse, often known as the eastern deer mouse, is a mammal from North America's eastern region. Like other Peromyscus species, it may serve as a vector and reservoir for emerging infectious illnesses like hantaviruses and Lyme disease.

The house mouse, scientifically known as Mus musculus, is a tiny mammal belonging to the Rodentia order with a pointed snout, enormous rounded ears, and a lengthy and almost hairless tail. The house mouse is one of the, if not the most common species in the genus Mus.

The groundhog is a type of rodent belonging to the family Sciuridae, genus Marmota, and order Rodentia. Groundhogs may wreak havoc on farmers and home gardeners, much to their delight. They adore eating veggies, leaving the soil weak in locations where they dig and causing damage to farm machinery and injuries to horses and livestock.

Moles are small mammals that live underground. They have fur that is soft and velvety. They have tiny eyes and ears, short hind limbs with large feet for digging, and powerful front limbs. Moles are a problem since they create underground tunnels, which damage grasses. Molehills and mole ridges reduce the beauty of grass and flower beds, while their tunneling damages young plant roots and exposes stones that can harm lawn equipment.

Voles are tiny rodents related to lemmings and hamsters, but with a bulkier body, a shorter hairy tail, a somewhat rounder head, smaller ears and eyes, and differently shaped molars. Some people call voles field mice or meadow mice. Voles also can ruin lawns and ground covers as they dig and create tunnels.

Raccoons are medium-sized mammals native to North America. They can be real pests when they choose to take shelter in your attic, garage, or storage shed. Not only can raccoons cause damage, but they can also create quite a mess! When raccoons shelter in your home, they will find food wherever they can, and that can be your trash cans! Raccoons are also known to carry several diseases that can be transferred through direct contact with an infected raccoon or indirect contact with items that have been exposed to infected raccoons. Raccoon roundworm (Baylisascaris), leptospirosis, and rabies are just a few of the illnesses that raccoons may spread.