Megarhyssa atrata
In 3 days ~10% in a week ~30%
Megarhyssa atrata, also known as the black giant ichneumonid wasp, is a species of large ichneumon wasp. It is known from North America, where it is found from Quebec, Michigan, Ohio, Connecticut, and North and South Carolina to Florida.
Adults are on wing from May to July. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Shenandoah National Park | 🇺🇸 United States |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Montreal | 🇨🇦 Canada | |
| 2 | Minneapolis [Saint Paul] | 🇺🇸 United States | |
| 3 | Toronto | 🇨🇦 Canada | |
| 4 | Chicago | 🇺🇸 United States | |
| 5 | Washington | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Black Giant Ichneumonid Wasp sighting in Shenandoah National Park on a given day, based on 6 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 571st most-seen of the 723 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
April–June and September
In those months about 10% of wildlife watchers report a Black Giant Ichneumonid Wasp in Shenandoah National Park on a given day, against under 5% in July–August and October–March, the lowest months.
Between 1 and 4 pm
Across all the parks we cover, that three-hour window holds the most Black Giant Ichneumonid Wasp sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only Shenandoah National Park, in our data
Shenandoah National Park is the only park on Wallace's Line with enough records to rate Black Giant Ichneumonid Wasp sightings: under 5% of wildlife watchers there report one on a given day.
Same order: Hymenoptera
The closest relatives of the Black Giant Ichneumonid Wasp that you can see in Shenandoah National Park (order Hymenoptera, Ants, Bees, Wasps, and Sawflies) are Common Eastern Bumble Bee (about 40%), Eastern Carpenter Bee (about 20%) and Eastern Black Carpenter Ant (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Black Giant Ichneumonid Wasp is recorded against all the insects logged in Shenandoah National Park (6 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.
