Bombus sitkensis
In 3 days ~20% in a week ~40%
Bombus sitkensis, the Sitka bumblebee, is a species of bumblebee common in western North America from Alaska to California. The Sitka bumblebee has an oblong head with a medium-length proboscis. The females (queens and workers) have black and yellow hairs intermixed on the face and forward part of the thorax and a black patch in the middle of the thorax, while their sides are yellowish. Terga (abdominal segments) 1 and 2 are yellow, and 3 and 4 black, the latter with a yellow posterior rim. The two last terga are brownish-red. The male has the face and forward parts of the thorax yellow, and only the posterior parts are darker (black and yellow intermixed). On the abdomen terga 1 and 2 are yellow, and terga 3 to 5 yellow on the anterior part, black on the posterior. The tail (terga 6 to 7) is brownish-red.
The species is a common bumblebee found in the western North America from Alaska and British Columbia, and Washington, to northern Idaho, western Montana, and the coastal parts of California. The Sitka bumblebee has experienced mild population declines in parks in California due to competition with the yellow-faced bumblebee (B. vosnesenskii) for... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Great Bear Rainforest | 🇨🇦 Canada | |
| 2 | Pacific Rim National Park Reserve | 🇨🇦 Canada | |
| 3 | Redwood National Park | 🇺🇸 United States | |
| 4 | Olympic National Park | 🇺🇸 United States | |
| 5 | Glacier National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Vancouver | 🇨🇦 Canada | |
| 2 | Seattle | 🇺🇸 United States | |
| 3 | San Francisco | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Sitka Bumble Bee sighting in Vancouver on a given day, based on 100 verified sightings from GBIF citizen-science data. It is the 76th most-seen of the 482 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.
March to June
In those months about 10% of wildlife watchers report a Sitka Bumble Bee in Vancouver on a given day, against under 5% in July to February, the lowest months.
Between 2 and 5 pm
Across all the parks we cover, that three-hour window holds the most Sitka Bumble Bee sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 3 cities where we can rate Sitka Bumble Bee sightings, Vancouver has the highest daily chance: about 10%. Next come Seattle (United States, under 5%) and San Francisco (United States, under 5%).
Same genus: Bombus
The closest relatives of the Sitka Bumble Bee that you can see in Vancouver (genus Bombus, Bumble Bees) are Common Eastern Bumble Bee (about 30%), Yellow-Faced Bumble Bee (about 30%) and Fuzzy-Horned Bumble Bee (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Sitka Bumble Bee is recorded against all the insects logged in Vancouver (100 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.
