Arge humeralis
In 3 days ~10%
Arge humeralis, the poison ivy sawfly, is a species of argid sawfly in the family Argidae. Larvae feed on poison ivy, Toxicodendron radicans. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Washington | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Poison Ivy Sawfly sighting in Washington on a given day, based on 6 verified sightings from GBIF citizen-science data. It is the 1533rd most-seen of the 1807 insects we can rate there. Over three days the chance rises to about 10%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Poison Ivy Sawfly in Washington on a given day, so our monthly data shows no clear season.
Only Washington, in our data
Washington is the only city on Wallace's Line with enough records to rate Poison Ivy Sawfly sightings: under 5% of wildlife watchers there report one on a given day.
Same order: Hymenoptera
The closest relatives of the Poison Ivy Sawfly that you can see in Washington (order Hymenoptera, Ants, Bees, Wasps, and Sawflies) are Common Eastern Bumble Bee (about 30%), Eastern Carpenter Bee (about 30%) and Brown-Belted Bumble Bee (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Poison Ivy Sawfly is recorded against all the insects logged in Washington (6 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.
