Smerinthus cerisyi
In 3 days ~40% in a week ~60%
Smerinthus cerisyi, the one-eyed sphinx or Cerisy's sphinx, is a moth of the family Sphingidae. The species was first described by William Kirby who named the species in honor of Alexandre Louis Lefèbvre de Cérisy in 1837.
It is known from south-eastern Alaska, the southern parts of all Canadian provinces and in the northern border states of the United States south into northern Indiana, Pennsylvania and Ohio and along the west coast to southern California, eastward to the Rocky Mountains and into western New Mexico north to western North Dakota. It has also been recorded from Illinois and as far south as Missouri.
The wingspan is 60-90 mm and the hindwing has a blue eyespot with a black center. The species is univoltine (has a single generation per year) and adults can be found through much of the summer. The adult moths do not feed. The moths are nocturnal and are attracted to light.
The larvae feed on willow (Salix), poplar (Populus), pear (Pyrus communis), plum (Prunus), and snowberry (Symphoricarpos). Smerinthus ophthalmica, formerly listed as a synonym of Smerinthus cerisyi, is thought to be a valid species. In 2018, Smerinthus... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Isle Royale National Park | 🇺🇸 United States | |
| 2 | Elk Island National Park | 🇨🇦 Canada | |
| 3 | Grand Teton National Park | 🇺🇸 United States | |
| 4 | Jasper National Park | 🇨🇦 Canada | |
| 5 | Riding Mountain National Park | 🇨🇦 Canada | |
| 6 | Pacific Rim National Park Reserve | 🇨🇦 Canada | |
| 7 | Glacier National Park | 🇺🇸 United States | |
| 8 | Rocky Mountain National Park | 🇺🇸 United States | |
| 9 | Banff National Park | 🇨🇦 Canada | |
| 10 | Grand Canyon National Park | 🇺🇸 United States | |
| 11 | Great Bear Rainforest | 🇨🇦 Canada | |
| 12 | Yellowstone National Park | 🇺🇸 United States | |
| 13 | Acadia National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Portland | 🇺🇸 United States | |
| 2 | Seattle | 🇺🇸 United States | |
| 3 | Vancouver | 🇨🇦 Canada | |
| 4 | Sacramento | 🇺🇸 United States | |
| 5 | Edmonton | 🇨🇦 Canada | |
| 6 | San Francisco | 🇺🇸 United States | |
| 7 | San Diego | 🇺🇸 United States | |
| 8 | Calgary | 🇨🇦 Canada | |
| 9 | Los Angeles | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a One-Eyed Sphinx sighting in Jasper National Park on a given day, based on 22 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 19th most-seen of the 88 insects we can rate there. Over three days the chance rises to about 40%, and over a week to about 60%, if each day is a fresh chance.
June
In that month about 30% of wildlife watchers report a One-Eyed Sphinx in Jasper National Park on a given day, against under 5% in August to April, the lowest months. That is one of Jasper National Park's wettest months, with about 110 mm of rain against 55 mm in April.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most One-Eyed Sphinx sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
4th of 13
Of the 13 parks where we can rate One-Eyed Sphinx sightings, Jasper National Park ranks 4th at about 10%. The best odds are in Isle Royale National Park (United States, about 20%), Elk Island National Park (Canada, about 20%) and Grand Teton National Park (United States, about 10%).
Same family: Sphingidae
The closest relatives of the One-Eyed Sphinx that you can see in Jasper National Park (family Sphingidae, Sphinx Moths) are Bedstraw Hawkmoth (about 20%) and Hummingbird Clearwing (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the One-Eyed Sphinx is recorded against all the insects logged in Jasper National Park (22 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.
