Leucorrhinia hudsonica
In 3 days ~10% in a week ~30%
The Hudsonian whiteface (Leucorrhinia hudsonica) is a species of dragonfly in the family Libellulidae. Its common name comes from where it is found, Hudson Bay. [[File:|thumb|right]] The Hudsonian whiteface has a length of 27 to 30 mm (1.1 to 1.2 in). Male dragonflies are black and marked with red on the thorax and the abdomen. The elongated spots on the abdomen are possibly pointed on one end, this forms a line along the length of the top side of the abdomen. The female is a dark brownish color and marked similarly to the male except the markings are yellow instead of black. Both sexes have creamy white faces.
The naiad of the Hudsonian whiteface has a length of 16 to 18 millimetres (0.63 to 0.71 in). Its abdomen is rounded, which gives it a short, stocky appearance known as the sprawler form. Naiads are brown with three dark stripes marking the length below the abdomen. In some cases, there are tiny hooks on abdominal segments three through six. Every side of abdominal segments eight and nine has a spine that points out away from the abdomen.
The Hudsonian whiteface is found in an area stretching from Alaska to Labrador... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Gros Morne National Park | 🇨🇦 Canada | |
| 2 | Cape Breton Highlands National Park | 🇨🇦 Canada | |
| 3 | Great Bear Rainforest | 🇨🇦 Canada | |
| 4 | Yosemite National Park | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Hudsonian Whiteface sighting in Yosemite National Park on a given day, based on 6 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 174th most-seen of the 227 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.
July
In that month about 10% of wildlife watchers report a Hudsonian Whiteface in Yosemite National Park on a given day, against under 5% in August to June, the lowest months. That is one of Yosemite National Park's driest months, with about 25 mm of rain against 220 mm in January.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Hudsonian Whiteface sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
4th of 4
Of the 4 parks where we can rate Hudsonian Whiteface sightings, Yosemite National Park ranks 4th at under 5%. The best odds are in Gros Morne National Park (Canada, about 10%), Cape Breton Highlands National Park (Canada, about 10%) and Great Bear Rainforest (Canada, under 5%).
GBIF citizen-science records
It is estimated from how often the Hudsonian Whiteface is recorded against all the insects logged in Yosemite 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.
