Catocala junctura
In 3 days ~10% in a week ~20%
Catocala junctura, the joined underwing or Stretch's underwing, is a moth in the family Erebidae. The species was first described by Francis Walker in 1858. It is found throughout temperate North America, ranging from New York and Pennsylvania west to Montana, Colorado, Oklahoma, Arizona, and into Texas, and north to southern Illinois, extreme southern Alberta and Saskatchewan; it has also been recorded west of the Rocky Mountains from California and south-eastern British Columbia. It is typically found near water, where the food plants of its caterpillar larvae grow plentifully.
The wingspan is 70–75 mm or more. The forewings are grayish to brownish with prominent black bands above, and whitish below. The upperside of the hindwings is orange red, with two roughly concentric blackish bands on each wing, and lacking hairs at the base. The outer band separates a margin that is lighter in color than the rest of the upper hindwing. The inner band does not reach the trailing edge; its hindward tip forms a hook which points back at the wing base, or almost so. The underside of the hindwings is whitish along the leading edge; the trailing three-quarters of the... Wikipedia →
| # | Park | Country | Daily sighting probability |
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More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Denver | 🇺🇸 United States | |
| 2 | Chicago | 🇺🇸 United States | |
| 3 | San Diego | 🇺🇸 United States | |
| 4 | Los Angeles | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Joined Underwing Moth sighting in San Diego on a given day, based on 13 verified sightings from GBIF citizen-science data. It is the 420th most-seen of the 693 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Joined Underwing Moth in San Diego on a given day, so our monthly data shows no clear season.
Among the best
Of the 4 cities where we can rate Joined Underwing Moth sightings, San Diego ranks 3rd at under 5%, level with the leaders once rounded. The best odds are in Denver (United States, under 5%) and Chicago (United States, under 5%).
Same family: Erebidae
The closest relatives of the Joined Underwing Moth that you can see in San Diego (family Erebidae, Underwing, Tiger, Tussock, and Allied Moths) are Salt Marsh Moth (about 10%), Western Tussock Moth (about 10%) and Painted Tiger Moth (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Joined Underwing Moth is recorded against all the insects logged in San Diego (13 verified sightings), 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.
