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Ants are the most common household pest in the United States, with over 700 species found across the country. Carpenter ants, fire ants, and odorous house ants are among the most problematic for homeowners. Colonies can number in the hundreds of thousands, making them persistent invaders once established.

Cockroaches are resilient pests that thrive in warm, moist environments and are most active at night. German cockroaches are the most common indoor species, while American cockroaches (palmetto bugs) are prevalent in the South. A single cockroach sighting often indicates a much larger hidden population.

Termites cause more than $5 billion in property damage annually in the United States, making them the most economically destructive pest. Subterranean termites are the most common and build colonies underground, while drywood termites infest wood directly. Damage often goes undetected for years because termites feed from the inside out.

Bed bugs are small, flat, reddish-brown insects that feed exclusively on blood, typically at night. They are expert hitchhikers that spread via luggage, used furniture, and clothing. Infestations have surged nationwide since the early 2000s and are not related to cleanliness — they can be found in any environment from luxury hotels to apartments.

Mice and rats are among the most destructive and unsanitary pests that invade homes. House mice, Norway rats, and roof rats are the most common species. Rodents gnaw constantly to wear down their teeth, damaging wiring, pipes, insulation, and structural materials. A single pair of mice can produce dozens of offspring in a year.

Most spiders found in homes are harmless and actually beneficial as predators of other insects. However, brown recluse and black widow spiders pose genuine health risks. Spiders typically enter homes seeking prey, warmth, or shelter, and heavy spider populations usually indicate an underlying insect problem.

Mosquitoes are more than a nuisance — they are the deadliest animals on Earth due to the diseases they transmit. In the U.S., West Nile virus, Eastern equine encephalitis, and Zika are the primary concerns. Female mosquitoes need blood to produce eggs and can detect hosts from over 100 feet away using carbon dioxide and body heat.

Wasps including yellow jackets, paper wasps, and hornets are beneficial predators of other insects but become dangerous when they nest near human activity. Unlike bees, wasps can sting multiple times. Yellow jackets are especially aggressive in late summer and fall when colonies are at peak size and food becomes scarce.

Fleas are tiny, wingless parasites that feed on the blood of mammals and can jump up to 150 times their body length. Cat fleas are the most common species found on both cats and dogs. A single female flea can lay up to 50 eggs per day, making infestations grow rapidly once established in a home.

Ticks are blood-feeding arachnids that transmit more pathogens to humans than any other arthropod in the United States. Blacklegged (deer) ticks, lone star ticks, and American dog ticks are the most common species. Ticks do not jump or fly — they wait on vegetation and attach to hosts that brush past.

Raccoons, squirrels, opossums, bats, skunks, and other wildlife frequently conflict with homeowners when they enter attics, crawl spaces, or chimneys. These animals can cause significant structural damage, create noise and odor problems, and carry diseases. Humane removal and exclusion are the standard professional approaches.