Hyalophora gloveri
In 3 days ~20% in a week ~40%
Hyalophora gloveri, or Glover's silkmoth, is a moth of the family Saturniidae. The species was first described by Ferdinand Heinrich Hermann Strecker in 1872. It is found in the Rocky Mountain states, the western parts of the northern Great Plains, and the Canadian prairie provinces, north-west to at least central Alberta. It is also found in northern Mexico.
It is considered a subspecies of Hyalophora columbia by several authorities. The wingspan is about 100 mm. The larvae feed on Shepherdia argentea, Elaeagnus angustifolia, Salix species, etc. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Grand Teton National Park | 🇺🇸 United States | |
| 2 | Elk Island National Park | 🇨🇦 Canada | |
| 3 | Zion National Park | 🇺🇸 United States | |
| 4 | Rocky Mountain National Park | 🇺🇸 United States | |
| 5 | Grand Canyon National Park | 🇺🇸 United States | |
| 6 | Yellowstone National Park | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Glover's Silkmoth sighting in Zion National Park on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 91st most-seen of the 114 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
May–June and September
In those months about 10% of wildlife watchers report a Glover's Silkmoth in Zion National Park on a given day, against under 5% in July–August and October–April, the lowest months. Those are among Zion National Park's driest months, with about 15 mm of rain a month against 75 mm in March.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Glover's Silkmoth sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 6 parks where we can rate Glover's Silkmoth sightings, Zion National Park ranks 3rd at about 10%, level with the leaders once rounded. The best odds are in Grand Teton National Park (United States, about 10%) and Elk Island National Park (Canada, about 10%).
Same order: Lepidoptera
The closest relatives of the Glover's Silkmoth that you can see in Zion National Park (order Lepidoptera, Butterflies and Moths) are Limenitis bredowii (about 40%), Two-Tailed Swallowtail (about 30%) and White-Lined Sphinx (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Glover's Silkmoth is recorded against all the insects logged in Zion National Park (5 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.
