Prenolepis imparis
In 3 days ~10% in a week ~30%
Prenolepis imparis, commonly known as the winter ant, false honey ant, or false honeypot ant, is a species of ant in the genus Prenolepis. The species is found in North America, from Canada to Mexico, nesting deep within the ground. Unusual among ants, Prenolepis imparis prefers lower temperatures, including near freezing, and is only active outside the nest during winter and early spring. Prenolepis imparis enters a hibernation-like state called aestivation during the summer.
P. imparis secretes an opaque white liquid from its abdomen as a defense against other ants, including Linepithema humile. The defensive secretions appear to be derived anatomically from the Dufour's gland and has been shown to contain a mixture of alkanes and alkenes including hexadecene, octadecene, tetradecene, octylcyclohexane, and hexadecane. Secretions from P. imparis have experimentally been shown to often kill L. humile workers. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Great Smoky Mountains National Park | 🇺🇸 United States | |
| 2 | Shenandoah National Park | 🇺🇸 United States | |
| 3 | Congaree National Park | 🇺🇸 United States | |
| 4 | Sequoia and Kings Canyon National Parks | 🇺🇸 United States | |
| 5 | Yosemite National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Boston | 🇺🇸 United States | |
| 2 | Philadelphia | 🇺🇸 United States | |
| 3 | Washington | 🇺🇸 United States | |
| 4 | San Francisco | 🇺🇸 United States | |
| 5 | New York City | 🇺🇸 United States | |
| 6 | Toronto | 🇨🇦 Canada | |
| 7 | Sacramento | 🇺🇸 United States | |
| 8 | Minneapolis [Saint Paul] | 🇺🇸 United States | |
| 9 | Chicago | 🇺🇸 United States | |
| 10 | Detroit | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report an American Winter Ant sighting in Yosemite National Park on a given day, based on 6 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 192nd most-seen of the 227 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
February and October–November
In those months about 10% of wildlife watchers report an American Winter Ant in Yosemite National Park on a given day, against under 5% in March–September and December–January, the lowest months.
Between 1 and 4 pm
Across all the parks we cover, that three-hour window holds the most American Winter Ant sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
5th of 5
Of the 5 parks where we can rate American Winter Ant sightings, Yosemite National Park ranks 5th at under 5%. The best odds are in Great Smoky Mountains National Park (United States, about 10%), Shenandoah National Park (United States, about 10%) and Congaree National Park (United States, about 10%).
Same family: Formicidae
The closest relatives of the American Winter Ant that you can see in Yosemite National Park (family Formicidae, Ants) are Western Black Carpenter Ant (about 10%) and Western Velvety Tree Ant (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the American Winter Ant is recorded against all the insects logged in Yosemite National Park (6 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
