Achyra rantalis
In 3 days ~20% in a week ~30%
Achyra rantalis, the garden webworm, is a moth of the family Crambidae described by Achille Guenée in 1854. It is found in North America, where it has been recorded from Maine to southern Quebec and Ontario, south to Florida and Mexico. It has also been recorded in Iowa, Colorado, California, and the West Indies. Its habitat consists of fields and gardens.
The wingspan is 17–23 millimetres (0.67–0.91 in). There may be up to four generations per year in the south. The larvae feed on the leaves of various low-growing plants, including alfalfa, beans, clover, corn, cotton, peas and strawberries. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Padre Island National Seashore | 🇺🇸 United States | |
| 2 | Big Bend National Park | 🇺🇸 United States | |
| 3 | Joshua Tree National Park | 🇺🇸 United States | |
| 4 | Saguaro National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Austin | 🇺🇸 United States | |
| 2 | Dallas | 🇺🇸 United States | |
| 3 | San Antonio | 🇺🇸 United States | |
| 4 | Ciudad Juárez | 🇲🇽 México | |
| 5 | Houston | 🇺🇸 United States | |
| 6 | Detroit | 🇺🇸 United States | |
| 7 | Boston | 🇺🇸 United States | |
| 8 | Toronto | 🇨🇦 Canada | |
| 9 | Mesa | 🇺🇸 United States | |
| 10 | Torreón | 🇲🇽 México |
With luck
About 10% of wildlife watchers report a Garden Webworm 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 20% of wildlife watchers report a Garden Webworm Moth in Big Bend National Park on a given day, against under 5% in November to July, 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 10 pm and 1 am
Across all the parks we cover, that three-hour window holds the most Garden Webworm Moth sightings with a recorded time, and about 6 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
Among the best
Of the 4 parks where we can rate Garden Webworm Moth sightings, Big Bend National Park ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Padre Island National Seashore (United States, about 10%).
Same family: Crambidae
The closest relatives of the Garden Webworm Moth that you can see in Big Bend National Park (family Crambidae, Crambid Snout Moths) are Four-Spotted Palpita Moth (about 10%), Yellow-Veined Moth (about 10%) and Hawaiian Beet Webworm Moth (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Garden Webworm 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.
