Hagenius brevistylus
In 3 days ~10% in a week ~20%
The dragonhunter (Hagenius brevistylus) is a clubtail dragonfly of the eastern United States and southeastern Canada. The dragonfly is much larger than any other North American clubtail, at 3.3 inches (84 mm), with black and yellow markings and green eyes. Males can be distinguished at a distance by their habit of curling their abdomens under while flying, forming a sideways J shape.
The dragonhunter is the only member of genus Hagenius. Its closest relatives are Asian dragonflies of genus Sieboldius, which are also sometimes called "dragonhunters". Together, the two genera form the subfamily Hageniinae.
The nymph is unusual, with a very flat, wide body. It is slow-moving and lives among bark and leaf litter at the edges of streams, where its dark color provides camouflage. The adult feeds on large insects, including darner and clubtail dragonflies, sometimes ambushing them from above. It also takes monarch butterflies, eating the thorax and abdomen first to avoid the greatest concentration of cardenolide toxins.
The genus name Hagenius was coined by Edmond de Sélys Longchamps in 1854 in honor of his collaborator and fellow entomologist Hermann August Hagen. The... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Voyageurs National Park | 🇺🇸 United States | |
| 2 | Congaree National Park | 🇺🇸 United States | |
| 3 | Great Smoky Mountains National Park | 🇺🇸 United States | |
| 4 | Shenandoah National Park | 🇺🇸 United States | |
| 5 | Acadia National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Baltimore | 🇺🇸 United States | |
| 2 | Austin | 🇺🇸 United States | |
| 3 | Washington | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Dragonhunter sighting in Washington on a given day, based on 18 verified sightings from GBIF citizen-science data. It is the 878th most-seen of the 1807 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 Dragonhunter in Washington on a given day, so our monthly data shows no clear season.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Dragonhunter 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 3 cities where we can rate Dragonhunter sightings, Washington ranks 3rd at under 5%, level with the leaders once rounded. The best odds are in Baltimore (United States, under 5%) and Austin (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Dragonhunter is recorded against all the insects logged in Washington (18 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.
