Hemaris gracilis
In 3 days ~20% in a week ~30%
Hemaris gracilis, the slender clearwing or graceful clearwing, is a moth of the family Sphingidae. The species was first described by Augustus Radcliffe Grote and Coleman Townsend Robinson in 1865. It is found in North America from Nova Scotia to central Florida along the East Coast and west through New England to Michigan to Saskatchewan. The species is listed as threatened in Connecticut and of Special Concern in Massachusetts.
The wingspan is 40–45 mm. It can be distinguished from similar species by a pair of red-brown bands on the sides of the thorax, which vary from green to yellow green dorsally and sometimes brown with white underneath. They have a red abdomen. The wings are transparent with reddish-brown borders. The outer edge of the forewing transparent area is even, and the forewing cell has a median row of scales.
There are probably two generations per year, with adults on wing from March to August. They feed on the nectar of various flowers, including Pontederia cordata, Rubus species, Taraxacum officinale, Hieracium aurantiacum, and Phlox species.
The larvae have been recorded feeding on Vaccinium vacillans and Kalmia... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Acadia National Park | 🇺🇸 United States |
More parks will be added in future updates.
With luck
About 10% of wildlife watchers report a Slender Clearwing sighting in Acadia National Park on a given day, based on 16 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 245th most-seen of the 405 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.
June and July
In those months about 10% of wildlife watchers report a Slender Clearwing in Acadia National Park on a given day, against under 5% in August to May, the lowest months.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Slender Clearwing sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only Acadia National Park, in our data
Acadia National Park is the only park on Wallace's Line with enough records to rate Slender Clearwing sightings: about 10% of wildlife watchers there report one on a given day.
Same genus: Hemaris
The closest relatives of the Slender Clearwing that you can see in Acadia National Park (genus Hemaris, Clearwings and Bee Hawkmoths) are Hummingbird Clearwing (about 10%) and Snowberry Clearwing (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Slender Clearwing is recorded against all the insects logged in Acadia National Park (16 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.
