---
title: "Deer Tick (Ixodes scapularis) | AnimalTracks.wiki"
description: "Waits on a plant for a passing host to brush by, then feeds for days."
image: "https://animaltracks.wiki/images/animals/deer-tick-1.webp"
published: "2026-10-11"
updated: "2026-10-12"
---
# Deer Tick (*Ixodes scapularis*)
> **Status**: Checked against 6 sources, listed under Sources below.
> **Tagline**: Waits on a plant for a passing host to brush by, then feeds for days.
> **Soundtrack Vibe**: Dream Pop & Shoegaze // Warpaint, "Undertow"
> **Soundtrack Links**: [Spotify](https://open.spotify.com/track/6vNcgPTLPyXflD733MmkAO)
> **Vibe Match**: A slow, swelling bassline, for a tick whose adult females feed on a deer for five to seven days while new, flexible cuticle lets them swell with blood.
## Biological Superpowers & Stats
- **Taxonomy**: *Ixodes scapularis*
- **Danger Level**: Deadly
- **Conservation Status**: Not Evaluated ([IUCN Red List](https://www.iucnredlist.org/))
- **Superpower**: Ambushes a passing host, then feeds for days while its new, flexible outer shell helps it swell
- **Habitat**: Humid deciduous forest and brushy habitat in eastern North America
- **Diet**: Blood: mice and other small mammals when young, deer for adult females
- **Tags**: arachnid, hematophagy, forest
## Natural History & Behavior
## Ambush from the vegetation
The deer tick, also called the blacklegged tick, is an arachnid. Adults and nymphs (the stage between larva and adult) both have eight legs. An adult is about 3 mm long, and a nymph is 1 to 2 mm, about the size of a poppy seed.
It does not chase anything. It waits on vegetation or on the ground until a host brushes past, generally catching it by the legs. Scientists call this waiting game "questing".
## Three hosts, three meals
This is a three-host tick: larva, nymph and adult each need a blood meal from a host. Larvae and nymphs then drop to the ground to molt, which means shedding the outer skin to grow. Larvae feed mostly on white-footed mice. Adult females feed on a white-tailed deer for five to seven days. Males rarely feed at all.
> **Built to swell**
> A meal lasts several days. As it feeds, the tick builds new, flexible cuticle (its outer shell), and that stretchy layer lets it swell up with blood.
Its host list is very wide. One guide lists hosts from 57 bird species, 41 mammal species and 11 lizard species.
## Two years, then breed and die
In the north-east and upper Midwest of the United States, where adults feed mostly on deer, the life cycle runs over two years. Animal Diversity Web puts its lifespan in the wild at about two years. Males die after mating, and females die after laying their eggs, typically on the forest floor.
Mate-finding is largely run by pheromones, chemical signals that draw ticks together. Its genome is 2.1 billion base pairs of DNA, which is large and packed with repeated sequences.
## Following the deer north
Its home is eastern North America, from the eastern United States west towards Texas and north into Minnesota and southeastern Canada. Moisture rules where it lives: it is extremely sensitive to drying out, and it suits deciduous forest with enough ground cover to keep the air very humid.
During the 20th century it spread through most of the eastern United States and into southern Canada, following forest regrowth and the return of white-tailed deer. A 2018 review cited an advance of about 46 km a year in Ontario.
Its bite matters because it carries *Borrelia burgdorferi*, the cause of Lyme disease. A 2018 review calls it a vector of seven human pathogens in the United States.
## Frequently Asked Questions
### Is a deer tick an insect?
No. Animal Diversity Web files it in the class Arachnida, and both the adult and the nymph walk on four pairs of legs. *(Source: [Animal Diversity Web, University of Michigan]())*
### How big is a deer tick?
Adults measure roughly 3 mm. Nymphs, the stage before adulthood, are smaller at around 1 to 2 mm, and Purdue Extension compares them to a poppy seed. *(Source: [Animal Diversity Web, University of Michigan]())*
### How long does a deer tick live?
Roughly two years in the wild, according to Animal Diversity Web. A genome study gives the same span for the full life cycle in the north-east and upper Midwest of the United States. *(Source: [Animal Diversity Web, University of Michigan]())*
### What does a deer tick eat?
Blood, and only blood. Larvae and nymphs feed on white-footed mice and other small mammals, and adult females feed on larger mammals such as deer. Males rarely feed at all. *(Source: [Animal Diversity Web, University of Michigan]())*
## Sources
1. [Ixodes scapularis (black legged tick). Animal Diversity Web, University of Michigan.]()
2. [Gulia-Nuss et al. (2016). Genomic insights into the Ixodes scapularis tick vector of Lyme disease. Nature Communications.]()
3. [Sonenshine (2018). Range Expansion of Tick Disease Vectors in North America: Implications for Spread of Tick-Borne Disease. International Journal of Environmental Research and Public Health.]()
4. [Eisen & Eisen (2018). The Blacklegged Tick, Ixodes scapularis : An Increasing Public Health Concern. Trends in Parasitology.]()
5. [Hill & MacDonald. The Biology and Medical Importance of Ticks in Indiana (E-243-W). Purdue Extension, Department of Entomology.]()
6. [Boulanger et al. (2025). Ticks and tick-borne diseases in the northern hemisphere affecting humans. Frontiers in Microbiology.]()
*Published October 11, 2026. Last updated October 12, 2026.*
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