Hyalophora cecropia
In 3 days ~20% in a week ~40%
Hyalophora cecropia, the cecropia moth, is North America's largest native moth. It is a member of the family Saturniidae, or giant silk moths. Females have been documented with a wingspan of 5 to 7 in (13 to 18 cm) or more. These moths can be found predominantly across eastern North America, with occurrences as far west as Washington and north into most Canadian provinces. Cecropia moth larvae are most commonly found on maple trees, but they have also been found on cherry and birch trees, among many others. The species was first described by Carl Linnaeus in his 1758 10th edition of Systema Naturae.
Like other members of the giant silk moth family, the adult cecropia moth lacks functional mouth parts and a digestive system, so they only survive for around 2 weeks. To find a mate, the female cecropia moth emits pheromones, which the male detects with his sensitive antennae. Male cecropia moths can detect these pheromones from up to a mile away, although a male may fly up to 7 miles while searching for a female. Mating typically begins early in the morning and lasts until the evening.
After mating, the female lays up to 100 eggs. These eggs are mottled reddish brown and... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Shenandoah National Park | 🇺🇸 United States | |
| 2 | Great Smoky Mountains National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Toronto | 🇨🇦 Canada | |
| 2 | Minneapolis [Saint Paul] | 🇺🇸 United States | |
| 3 | Montreal | 🇨🇦 Canada | |
| 4 | Detroit | 🇺🇸 United States | |
| 5 | Philadelphia | 🇺🇸 United States | |
| 6 | Boston | 🇺🇸 United States | |
| 7 | Washington | 🇺🇸 United States | |
| 8 | Austin | 🇺🇸 United States | |
| 9 | New York City | 🇺🇸 United States | |
| 10 | Chicago | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Cecropia Moth sighting in Detroit on a given day, based on 14 verified sightings from GBIF citizen-science data. It is the 127th most-seen of the 268 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.
April to August
In those months about 10% of wildlife watchers report a Cecropia Moth in Detroit on a given day, against under 5% in September to March, the lowest months.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Cecropia Moth sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 11 cities where we can rate Cecropia Moth sightings, Detroit ranks 4th at about 10%, level with the leaders once rounded. The best odds are in Toronto (Canada, about 10%), Minneapolis [Saint Paul] (United States, about 10%) and Montreal (Canada, about 10%).
GBIF citizen-science records
It is estimated from how often the Cecropia Moth is recorded against all the insects logged in Detroit (14 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.
