Polydrusus impressifrons
In 3 days ~20% in a week ~40%
Polydrusus impressifrons, known generally as the pale green weevil or leaf weevil, is a species of broad-nosed weevil in the beetle family Curculionidae. It is native to Europe, but was introduced to North America in the early 20th Century. They feed on fruit trees and hardwood trees. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Grand Teton National Park | 🇺🇸 United States | |
| 2 | Glacier National Park | 🇺🇸 United States | |
| 3 | Riding Mountain National Park | 🇨🇦 Canada |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Calgary | 🇨🇦 Canada | |
| 2 | Denver | 🇺🇸 United States | |
| 3 | Toronto | 🇨🇦 Canada | |
| 4 | Salt Lake City | 🇺🇸 United States | |
| 5 | Munich | 🇩🇪 Germany | |
| 6 | Paris | 🇫🇷 France | |
| 7 | Copenhagen | 🇩🇰 Denmark | |
| 8 | Minneapolis [Saint Paul] | 🇺🇸 United States | |
| 9 | Montreal | 🇨🇦 Canada | |
| 10 | London | 🇬🇧 United Kingdom |
With luck
About 10% of wildlife watchers report a Pale Green Weevil sighting in Calgary on a given day, based on 71 verified sightings from GBIF citizen-science data. It is the 49th most-seen of the 256 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
June
In that month about 20% of wildlife watchers report a Pale Green Weevil in Calgary on a given day, against under 5% in August to April, the lowest months. That is one of Calgary's wettest months, with about 120 mm of rain against 15 mm in January.
Between 1 and 4 pm
Across all the parks we cover, that three-hour window holds the most Pale Green Weevil sightings with a recorded time, and about 7 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 11 cities where we can rate Pale Green Weevil sightings, Calgary has the highest daily chance: about 10%. Next come Denver (United States, about 10%) and Toronto (Canada, under 5%).
Same family: Curculionidae
The closest relatives of the Pale Green Weevil that you can see in Calgary (family Curculionidae, True Weevils) are Raucous Broad-Nosed Weevil (about 10%) and Strawberry Root Weevil (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Pale Green Weevil is recorded against all the insects logged in Calgary (71 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.
