Arigomphus cornutus
In 3 days ~10% in a week ~20%
The horned clubtail (Arigomphus cornutus) is a clubtail dragonfly of Canada and the United States. The horned clubtail is 2.2 inches (56 mm) long and lacks an abdominal club. It has a greenish thorax with black stripes and a black abdomen with a light stripe along the top. It has blue eyes and black legs. It also has distinctive wide forked yellow claspers shaped like cow horns and a large sloped bridge between the eyes.
The horned clubtail lives in ponds and sluggish streams. Its range includes Canada and several U.S. states: Colorado Iowa Minnesota Montana – Carter, Custer, Fallon, Powder River, and Wibaux Counties; only in artificial reservoirs.
Nebraska – Cherry and Cuming Counties New York – (rarely) North Dakota South Dakota Wisconsin Wyoming Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Montreal | 🇨🇦 Canada | |
| 2 | Minneapolis [Saint Paul] | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Horned Clubtail sighting in Montreal on a given day, based on 11 verified sightings from GBIF citizen-science data. It is the 599th most-seen of the 926 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Horned Clubtail in Montreal on a given day, so our monthly data shows no clear season.
Yes
Of the 2 cities where we can rate Horned Clubtail sightings, Montreal has the highest daily chance: under 5%. Next come Minneapolis [Saint Paul] (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Horned Clubtail is recorded against all the insects logged in Montreal (11 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.
