Holorusia hespera
In 3 days ~10% in a week ~20%
Holorusia hespera, the giant western crane fly, is a species of crane fly in the family Tipulidae. It is found in western North America. H. hespera is the largest North American species of cranefly, with wings reaching lengths of 40 mm (1.6 in). The species is noted to lack wing interference patterning on the glossy amber colored wing surface, suggested to be a result of the wing thickness. The wing surfaces are textured with ridging and folds and the coloration is uniform across the wing. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sequoia and Kings Canyon National Parks | 🇺🇸 United States | |
| 2 | Yosemite National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Seattle | 🇺🇸 United States | |
| 2 | Vancouver | 🇨🇦 Canada | |
| 3 | Portland | 🇺🇸 United States | |
| 4 | San Francisco | 🇺🇸 United States | |
| 5 | Los Angeles | 🇺🇸 United States | |
| 6 | San Diego | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Giant Western Crane Fly sighting in Vancouver on a given day, based on 35 verified sightings from GBIF citizen-science data. It is the 153rd most-seen of the 482 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.
June and July
In those months about 10% of wildlife watchers report a Giant Western Crane Fly in Vancouver on a given day, against under 5% in August to May, the lowest months. Those are among Vancouver's driest months, with about 35 mm of rain a month against 210 mm in November.
Between 1 and 4 pm
Across all the parks we cover, that three-hour window holds the most Giant Western Crane Fly sightings with a recorded time, and about 6 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
Among the best
Of the 6 cities where we can rate Giant Western Crane Fly sightings, Vancouver ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Seattle (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Giant Western Crane Fly is recorded against all the insects logged in Vancouver (35 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.
