Bombus bimaculatus
In 3 days ~60% in a week ~90%
The two-spotted bumble bee (Bombus bimaculatus) is a species of social bumble bee found in the eastern half of the United States and the adjacent south-eastern part of Canada. In older literature this bee is often referred to as Bremus bimaculatus, Bremus being a synonym for Bombus. The bee's common name comes from the two yellow spots on its abdomen. Unlike many of the other species of bee in the genus Bombus, B. bimaculatus is not on the decline, but instead is very stable. They are abundant pollinators that forage at a variety of plants.
Bombus bimaculatus is in the subgenus Pyrobombus, which is closely related to the subgenera Alpinobombus and Bombus out of the 15 total. Within Pyrobombus, B. bimaculatus is most closely related to B. monticola, B. sylvicola, and B. lapponicus. Additionally, B. bimaculatus can oftentimes be confused with B. impatiens and B. griseocollis, as their colorations are very similar.
Bombus bimaculatus was first described by Ezra Townsend Cresson, an American entomologist, in 1863. Workers look very similar to queens, with the two mainly distinguished by size. Sometimes large workers can be mistaken for... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Acadia National Park | 🇺🇸 United States | |
| 2 | Great Smoky Mountains National Park | 🇺🇸 United States | |
| 3 | Shenandoah National Park | 🇺🇸 United States | |
| 4 | Point Pelee National Park | 🇨🇦 Canada | |
| 5 | Riding Mountain National Park | 🇨🇦 Canada |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Minneapolis [Saint Paul] | 🇺🇸 United States | |
| 2 | Boston | 🇺🇸 United States | |
| 3 | Chicago | 🇺🇸 United States | |
| 4 | Montreal | 🇨🇦 Canada | |
| 5 | Toronto | 🇨🇦 Canada | |
| 6 | Philadelphia | 🇺🇸 United States | |
| 7 | Detroit | 🇺🇸 United States | |
| 8 | Washington | 🇺🇸 United States | |
| 9 | Baltimore | 🇺🇸 United States | |
| 10 | New York City | 🇺🇸 United States |
Possible
About 20% of wildlife watchers report a Two-Spotted Bumble Bee sighting in Acadia National Park on a given day, based on 171 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 10th most-seen of the 405 insects we can rate there. Over three days the chance rises to about 60%, and over a week to about 90%, if each day is a fresh chance.
July
In that month about 40% of wildlife watchers report a Two-Spotted Bumble Bee in Acadia National Park on a given day, against under 5% in September to March, the lowest months.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Two-Spotted 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 5 parks where we can rate Two-Spotted Bumble Bee sightings, Acadia National Park has the highest daily chance: about 20%. Next come Great Smoky Mountains National Park (United States, about 10%) and Shenandoah National Park (United States, about 10%).
Same genus: Bombus
The closest relatives of the Two-Spotted Bumble Bee that you can see in Acadia National Park (genus Bombus, Bumble Bees) are Tricolored Bumble Bee (about 40%), Common Eastern Bumble Bee (about 30%) and Perplexing Bumble Bee (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Two-Spotted Bumble Bee is recorded against all the insects logged in Acadia National Park (171 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.
