Halysidota davisii
In 3 days ~20% in a week ~30%
Halysidota davisii, or Davis' tussock moth, is a species of moth in the family Erebidae. It was described by Henry Edwards in 1874. It is found in Utah, Arizona, New Mexico and north-western Texas. Adults are on wing from July to August.
The larvae have been recorded feeding on Quercus emoryi and Celtis species. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Big Bend National Park | 🇺🇸 United States |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Mexico City | 🇲🇽 México |
With luck
About 10% of wildlife watchers report a Davis' Tussock Moth sighting in Big Bend National Park on a given day, based on 8 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 221st most-seen of the 329 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 30%, if each day is a fresh chance.
September
In that month about 30% of wildlife watchers report a Davis' Tussock Moth in Big Bend National Park on a given day, against under 5% in October to August, the lowest months. That is one of Big Bend National Park's wettest months, with about 50 mm of rain against 10 mm in April.
Between 11 pm and 2 am
Across all the parks we cover, that three-hour window holds the most Davis' Tussock Moth sightings with a recorded time, and nearly all of them come between 6 pm and 6 am: it is mostly seen at night.
Only Big Bend National Park, in our data
Big Bend National Park is the only park on Wallace's Line with enough records to rate Davis' Tussock Moth sightings: about 10% of wildlife watchers there report one on a given day.
Same family: Erebidae
The closest relatives of the Davis' Tussock Moth that you can see in Big Bend National Park (family Erebidae, Underwing, Tiger, Tussock, and Allied Moths) are Bird Toxonprucha (about 20%), Lophocampa bicolor (about 10%) and Paler Graphic (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Davis' Tussock Moth is recorded against all the insects logged in Big Bend National Park (8 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.
