Ticks

Ticks are small, blood-feeding arachnids (relatives of spiders and mites, not insects) that wait on grass, brush and leaf litter for a person or animal to brush past, then crawl to a sheltered spot and attach for days. They can't fly or jump. They matter more than their size suggests because several US species spread Lyme disease, Rocky Mountain spotted fever, ehrlichiosis and the red-meat allergy known as alpha-gal syndrome.

The good news: ticks are slow, predictable and usually need many hours of attachment to transmit infection. Knowing where they wait, and checking yourself, your kids and your pets after outdoor time, prevents most problems.

What ticks look like

• Body: flat, oval, teardrop-shaped when unfed; balloon-like and gray-blue or tan when full of blood.
• Legs: 8 as nymphs and adults, 6 as larvae (the "seed ticks"). No antennae, no wings.
• Mouthparts: visible at the front, pointing forward. This is what distinguishes a tick from a small beetle or spider at a glance.
• Size: larvae are the size of a grain of sand, nymphs a poppy seed, adults a sesame seed to a small apple seed. An engorged American dog tick female can reach about 1/2 inch and look like a dark pinto bean.

The species most Americans meet are the blacklegged (deer) tick, American dog tick, lone star tick, brown dog tick and Gulf Coast tick. See types of ticks for identification and a look-alike table, and seed ticks for the tiny larvae that show up by the hundreds.

Where do ticks live?

Ticks need humidity more than anything. They lose water fast in sun and wind, so they concentrate in shade. On Connecticut properties studied by the state's Agricultural Experiment Station, 67% of blacklegged ticks were in the woods, 22% in the brushy edge, 9% in ornamental plantings and just 2% in the lawn. Of the lawn ticks, 82% were within 3 yards of the edge. Look for ticks:

• where woods meet lawn, and the first few yards of grass beside it;
• in leaf litter, ground cover (ivy, pachysandra), stone walls and woodpiles;
• in tall grass and brush along trails, fields and fence lines;
• anywhere deer, mice, chipmunks, raccoons and ground birds travel.

Regionally, the lone star tick dominates the South and East and is spreading north. Blacklegged ticks carry Lyme in the Northeast, mid-Atlantic and upper Midwest. The American dog tick lives across most of the country east of the Rockies, and the western blacklegged tick covers the Pacific coast. The Asian longhorned tick, first found in the US in 2017, had reached 20 eastern states by 2024.

Where do ticks come from?

Ticks arrive on wildlife. A deer or mouse drops a fed female in your yard, and she lays one batch of eggs (about 1,000 to several thousand, depending on species) in leaf litter and dies. The larvae hatch and climb grass stems together. That's why ticks often appear in clusters, and why reducing hosts and their cover matters as much as any spray.

Ticks in the house almost always rode in. URI's TickEncounter lists pets as the most common route, then clothes, backpacks and blankets. The exception is the brown dog tick, which can live and breed indoors in homes and kennels with dogs.

Do ticks fly or jump?

No. Ticks cannot fly, jump or drop on purpose from trees. They "quest": they climb a grass blade or twig, hold out their front legs, and hook onto whatever brushes by. Most people pick them up at the shin and ankle, and the tick then walks upward looking for thin, warm skin: behind the knees, waistband, armpits, groin, hairline and behind the ears. Ticks found on your scalp almost always climbed there.

Lone star ticks bend the rule a little: they actively crawl across the ground toward people standing or sitting still. They still don't jump.

Life cycle and how long ticks live

Hard ticks go through egg, six-legged larva, eight-legged nymph and adult. Each active stage takes one blood meal over several days, drops off, and molts. The whole cycle usually takes two years (blacklegged and lone star ticks) and can stretch to three, or shrink to one in the warm South. A tick spends almost all of its life off the host.

How long ticks survive without a meal depends on humidity. Most hard ticks that don't find a host die within months, or a year or two at most. Lab records for the American dog tick reach 540 days for larvae, 584 for nymphs and 1,053 for adults. Indoors it's different: blacklegged nymphs can live over 6 months at near-100% humidity, but more than half die within 4 days at 65%.

Nymphs cause most human Lyme infections: CDC notes they're active April through July and easy to miss. Adult blacklegged ticks stay active in fall and on winter days above freezing.

Ticks on humans

A tick on you is not an emergency. Remove it promptly with fine-tipped tweezers, gripping at the skin and pulling straight up. Don't twist, burn, or smother it with petroleum jelly or nail polish; that only delays removal.

Show photoclose-up of an insect or bite, you can hide it again

For which ticks carry Lyme disease, what a bull's-eye rash looks like, and when to see a doctor, read tick bites.

Ticks on dogs and cats

Dogs pick up far more ticks than people because they run through brush nose-first. CDC lists the usual spots: in and around the ears, eyelids, under the collar, between the toes and around the tail. Check them daily in season.

A fully embedded, engorged tick looks like a gray or tan bean; owners often mistake it for a skin tag or wart. Look for the tiny legs at the skin line. A dusting of "pepper flakes" in the fur after a walk is usually a clump of larval ticks.

Signs of tick-borne disease in dogs can take 7 to 21 days or longer to show up: lethargy, lameness, fever, loss of appetite. Most canine tick diseases have no vaccine; Lyme is the exception, so ask your vet about it in Lyme areas.

Cats get ticks less often but are not immune, especially outdoor cats. CDC's advice is blunt: don't put any tick product on a cat without asking your vet. Many dog products contain permethrin, which is toxic to cats.

What eats ticks?

Plenty of animals eat a few: guinea fowl, chickens, wild turkeys, some songbirds, ants, spiders, plus fungi and a tiny parasitic wasp. None of them controls ticks.

• Guinea fowl eat adult ticks. In the studies Penn State Extension reviewed, they did not reduce nymphs, the stage behind most Lyme cases, and can even carry nymphs themselves.
• Chickens have no North American studies showing they lower tick numbers. Their feed also draws mice, a prime host for young ticks.
• Opossums are the famous myth. The "5,000 ticks" figure came from one lab estimate (per year, not per week), and a later study found no ticks in the stomachs of 32 wild opossums.
• Wild turkeys foraging didn't reduce adult tick numbers in Connecticut research.

Treat predators as a bonus, not a plan.

Are ticks dangerous?

Depending on species and region, ticks can spread:

• Lyme disease (blacklegged and western blacklegged ticks);
• anaplasmosis, babesiosis and Powassan virus (blacklegged ticks);
• ehrlichiosis and alpha-gal syndrome (mainly lone star ticks);
• Rocky Mountain spotted fever (American dog, Rocky Mountain wood and brown dog ticks);
• tick paralysis, a rare reversible condition from a long-attached female.

Risk climbs with attachment time, so daily checks are the single cheapest protection.

What people who dealt with it say

Homeowners new to tick country tend to go through the same steps:

• First move: spray the whole yard. It rarely works on its own. The top advice from both homeowners and pros is to clear brush and tall grass, then mow; ticks live at the shady edge, not in the middle of a sunny lawn.
• Pros correct the same myths: ticks don't fall from trees, they live in leaf litter at the woods edge; and opossums are not tick vacuums.
• Chicken and guinea fowl owners report fewer ticks on their dogs, but the research doesn't show a real drop. Keep birds if you like them, not as tick control.
• The dog is the main tick taxi. People with dogs on a reliable preventive and a daily check report far fewer ticks in the house.
• A newly adopted dog with ticks on the pillows usually means brown dog ticks, which need vet treatment for the dog and often professional treatment of the home.

Prevention in one minute

1. Wear EPA-registered repellent (DEET, picaridin, IR3535, oil of lemon eucalyptus) on skin; treat clothes and boots with 0.5% permethrin.
2. Stay mid-trail; avoid brushing through tall grass and sitting on leaf litter.
3. Put clothes in a hot dryer for 10 minutes after outdoor time. Washing in cold or warm water doesn't kill ticks.
4. Shower within two hours and do a full-body tick check.
5. Keep pets on a vet-approved tick preventive.

For the yard itself (wood-chip barriers, leaf litter, targeted sprays, when to hire a pro) see how to get rid of ticks.

When to call a professional

Call a licensed pest control company if you keep finding ticks on lawn areas near the house despite cleanup, if ticks are crawling up walls indoors (a sign of brown dog ticks), or if anyone in the household is at high risk. Typical perimeter tick treatments run about $75–$150 per visit, with seasonal programs around $350–$700 (approximate; varies by region and yard size).