Wolf spiders are moderate to large-sized spiders (¼- to 1-inch long) with dark brown and slightly hairy bodies.

They are found on the ground or under stones in a variety of habitats, such as woodlands, grassy meadows, beaches, landscapes, gardens and fields. Some even live underground.

They commonly hunt during the day or at night when it is warm.

Wolf spiders are alarming because of their large size and rapid movements. They are not aggressive.

Sac spiders are normally found on foliage or on the ground. They are small to medium-sized spiders (1/5- to 2/5-inch long) and are usually yellowish or light-colored.

Sac spiders hunt at night, feeding chiefly on small insects, and hide during the day in a silken tube or sac, from which they take their name.

They do not construct webs. Outdoors, they usually roll up leaves into a tube or may construct a retreat under stones.

Inside buildings, sac spiders are found in retreats in a variety of places including high up on walls near ceilings.

Fishing spiders are typically seen near ponds, swamps, or slow-moving streams, but some may be found at considerable distances from water.

Fishing spiders are the largest spiders in the Upper Midwest (1-inch long). With legs spread out, some fishing spiders cover as much as 4 inches.

They are generally dark-colored, usually brownish or grayish, with white markings.

Fishing spiders can “skate” across water and can dive underneath to capture prey.

They also can catch tadpoles, small fish and other small vertebrate animals.

Sowbug spider, also known as the woodlouse hunter or the dysderid spider, is an introduced species that is now common in the United States.

This medium-sized spider has distinctive coloration: the cephalothorax is purplish-brown, the abdomen is grayish-white, and the legs are orange.

Unlike the majority of spiders, the dysderid spider has only 6 eyes.

The fangs are quite large and project forward.

They wander at night in search of food and are ground-dwellers commonly found under rocks and debris.

Their preferred prey are sowbugs and pillbugs.

Jumping spiders are compact, medium-sized spiders that leap on their prey, often jumping many times their own body length.

They are active during the day and are often found on windows, ceilings, walls, and other areas exposed to sunlight. They are about ¼- to ½-inch long and dark-colored with white markings.

Some can be brightly colored, including some with iridescent mouthparts.

These spiders move quickly in jerky, irregular motions and can run sideways and backward.

Jumping spiders have the best vision of spiders (have large middle eyes), seeing objects up to eight inches away.

Parson spider is a medium-sized spider (½-inch long) with a brownish body and gray abdomen with a white band running down over half the length of its abdomen.

Parson spiders move quickly. They actively hunt at night and chase their prey.

During the day, they are found outdoors under stones or loose bark.

Indoors, they hide under objects or in cracks or crevices.

They have been known to bite if trapped inside clothing or bedding. The bite can be painful and may cause allergic reactions in some people.

Crab spiders are small to medium-sized spiders (1/10- to 2/5-inch long) ranging in color from yellow or red to brown or gray.

The first four legs are longer than the back four and are held out to the sides giving a crab-like appearance. They can walk forward, sideways, or backward.

They are passive hunters; they wait motionless and feed on insects that pass by closely.

Crab spiders are often found outdoors on flowers, stems or leaves.

They are rarely found indoors.