Aedes sierrensis
In 3 days ~10% in a week ~30%
Aedes sierrensis, or Western tree hole mosquito, is a species of mosquito in the genus Aedes native to western North America. It is primarily found in areas with oak and mixed deciduous forests, ranging from southern California to British Columbia, and reaching as far east as Utah. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Great Bear Rainforest | 🇨🇦 Canada |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | San Francisco | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Western Treehole Mosquito sighting in Great Bear Rainforest on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 200th most-seen of the 235 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 and August
In those months about 10% of wildlife watchers report a Western Treehole Mosquito in Great Bear Rainforest on a given day, against under 5% in September to June, the lowest months. Those are among Great Bear Rainforest's driest months, with about 140 mm of rain a month against 480 mm in November.
Between 2 and 5 pm
Across all the parks we cover, that three-hour window holds the most Western Treehole Mosquito 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.
Only Great Bear Rainforest, in our data
Great Bear Rainforest is the only park on Wallace's Line with enough records to rate Western Treehole Mosquito sightings: under 5% of wildlife watchers there report one on a given day.
Same order: Diptera
The closest relatives of the Western Treehole Mosquito that you can see in Great Bear Rainforest (order Diptera, Flies) are Western Pond Fly (about 20%), Melanostoma mellina (about 20%) and Common Drone Fly (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Western Treehole Mosquito is recorded against all the insects logged in Great Bear Rainforest (5 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.
