Blacklegged Tick

Blacklegged Tick facts at a glance

How big is a blacklegged tick?

An adult blacklegged tick measures 0 cm long — a small fraction of the height of an average adult person (1.73 m) — and weighs around 0 g, a small fraction of an average adult’s body weight (70 kg).

What is a group of blacklegged ticks called?

Explore more animal collective nouns and baby animal names .

Three-host life cycle

Blacklegged ticks feed once at each life stage — larva, nymph, and adult — dropping off between hosts to moult. White-tailed deer are critical adult hosts that distribute ticks, while mice and birds infect nymphs with Lyme bacteria during larval and nymphal feeds.

Questing behaviour

Ticks climb vegetation and extend front legs to latch onto passing hosts — a behaviour called questing. They detect carbon dioxide, heat, and vibration. Permethrin-treated clothing and DEET repellents reduce attachment during hiking.

Lyme disease transmission

Ixodes scapularis is the primary vector of Borrelia burgdorferi, the bacterium causing Lyme disease in the United States. Nymphs — active in late spring and summer — cause most human infections because they are small and easily overlooked. Prompt tick removal within 24–36 hours reduces transmission risk.

Expanding range

Climate warming and reforestation expand tick range northward and into Canada. Not Evaluated by IUCN, blacklegged ticks are a major public health concern rather than a conservation species. Landscape management and deer control can reduce local abundance.

Did you know? Blacklegged Tick facts

• The blacklegged tick, also called the deer tick, is a tiny arachnid that attaches to hosts and feeds on blood, transmitting Lyme disease and other pathogens in eastern North America.
• Another name for the blacklegged tick (Ixodes scapularis) — named because white-tailed deer are important hosts for adult ticks, though deer do not transmit Lyme bacteria.
• Use fine tweezers to grasp the tick close to the skin and pull steadily upward without twisting. Clean the bite area and monitor for rash or fever.
• No — only some blacklegged ticks are infected, and rates vary by region. Other tick species carry different diseases.
• Nymphs peak in May–July; adults in fall. Ticks can be active whenever temperatures exceed roughly 4°C (40°F).
• Conservation: Not Evaluated (IUCN).

Diet & feeding

Blacklegged Tick feeds primarily as a blood — feeds on mammals, birds, and reptiles. Blacklegged ticks feed once at each life stage — larva, nymph, and adult — dropping off between hosts to moult. White-tailed deer are critical adult hosts that distribute ticks, while mice and birds infect nymphs with Lyme bacteria dur

Adaptations

• Blacklegged ticks feed once at each life stage — larva, nymph, and adult — dropping off between hosts to moult. White-tailed deer are critical adult hosts that distribute ticks, while mice and birds infect nymphs with Lyme bacteria during larval and nymphal feeds.
• Ticks climb vegetation and extend front legs to latch onto passing hosts — a behaviour called questing. They detect carbon dioxide, heat, and vibration. Permethrin-treated clothing and DEET repellents reduce attachment during hiking.

Behaviour & ecology

• Blacklegged ticks feed once at each life stage — larva, nymph, and adult — dropping off between hosts to moult. White-tailed deer are critical adult hosts that distribute ticks, while mice and birds infect nymphs with Lyme bacteria during larval and nymphal feeds.
• Ticks climb vegetation and extend front legs to latch onto passing hosts — a behaviour called questing. They detect carbon dioxide, heat, and vibration. Permethrin-treated clothing and DEET repellents reduce attachment during hiking.
• Ixodes scapularis is the primary vector of Borrelia burgdorferi, the bacterium causing Lyme disease in the United States. Nymphs — active in late spring and summer — cause most human infections because they are small and easily overlooked. Prompt tick removal within 24–36 hours reduces transmission risk.

Communication

• Blacklegged Tick uses scent, posture, and vocal signals to mark territory and coordinate social behaviour.
• Communication intensity often peaks during breeding seasons and territorial disputes.

Habitat & range

Deciduous forests, leaf litter, and grassy edges of eastern North America

Ecological role

Blacklegged Tick plays a recognised ecological role in deciduous forests, leaf litter, and grassy edges of eastern north america.

Conservation status of the Blacklegged Tick

Sources & references

This guide is compiled and reviewed against established zoological and conservation references. Key sources for the Blacklegged Tick:

• IUCN Red List of Threatened Species

  Conservation status (Not Evaluated) reflects the IUCN Red List category for Ixodes scapularis.

• iNaturalist — observations & photos

  Search citizen-science observations and community IDs for Ixodes scapularis. Useful for range checks and recent sightings — not a substitute for formal Red List status.

• GBIF — occurrence data

  Global Biodiversity Information Facility species search for Ixodes scapularis. Explore published occurrence records used in range research.

• IUCN Red List — Ixodes scapularis.

  Conservation status (Not Evaluated) and population trends.

• Animal Diversity Web — Ixodes scapularis. University of Michigan Museum of Zoology.

  Life history, morphology, and range.

• Global Animal Guide editorial standards

  How we research, source, review, and update every guide for accuracy.