Bombus melanopygus
In 3 days ~60% in a week ~90%
Bombus melanopygus, the black-tailed bumble bee, black tail bumble bee or orange-rumped bumblebee, is a species of bumblebee native to western North America. This bee is widely distributed across western North America, from the Pacific to the Rocky Mountains, and from Alaska to Baja California.
There are two forms of the black-tailed bumblebee: Red form (“red butts,” Bombus melanopygus melanopygus) found primarily in higher latitudes of Oregon and points north, and in the Mountain West Dark color form (Bombus melanopygus edwardsii) is most common in California and southern Oregon
(The second and third abdominal segments are red in northern populations and black in southern; individuals with black segments were previously known as Bombus edwardsii, a separate species. Genetic analyses support the conclusion that the two forms are the same species, with B. edwardsii as a synonym.)
This bumblebee can utilize a number of habitat types, including agricultural and urban areas. It is "one of the few bumblebees still found regularly in San Francisco". It feeds on many types of plants, including manzanitas, Ceanothus, goldenbushes, wild buckwheats, lupines, penstemons, rhododendrons, willows, sages, and clovers. It nests underground or aboveground in structures.
This species is a host to the zombie fly (Apocephalus borealis). Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Wrangell-St. Elias National Park | 🇺🇸 United States | |
| 2 | Pacific Rim National Park Reserve | 🇨🇦 Canada | |
| 3 | Glacier National Park | 🇺🇸 United States | |
| 4 | Great Bear Rainforest | 🇨🇦 Canada | |
| 5 | Channel Islands National Park | 🇺🇸 United States | |
| 6 | Olympic National Park | 🇺🇸 United States | |
| 7 | Jasper National Park | 🇨🇦 Canada | |
| 8 | Banff National Park | 🇨🇦 Canada | |
| 9 | Sequoia and Kings Canyon National Parks | 🇺🇸 United States | |
| 10 | Redwood National Park | 🇺🇸 United States | |
| 11 | Yosemite National Park | 🇺🇸 United States | |
| 12 | Rocky Mountain National Park | 🇺🇸 United States | |
| 13 | Saguaro National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Portland | 🇺🇸 United States | |
| 2 | Seattle | 🇺🇸 United States | |
| 3 | Sacramento | 🇺🇸 United States | |
| 4 | Vancouver | 🇨🇦 Canada | |
| 5 | San Francisco | 🇺🇸 United States | |
| 6 | San Diego | 🇺🇸 United States | |
| 7 | Los Angeles | 🇺🇸 United States |
Possible
About 20% of wildlife watchers report a Black-Tailed Bumble Bee sighting in Portland on a given day, based on 725 verified sightings from GBIF citizen-science data. It is the 3rd most-seen of the 507 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.
May
In that month about 50% of wildlife watchers report a Black-Tailed Bumble Bee in Portland on a given day, against about 10% in January, July–September and November, the lowest months.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Black-Tailed 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 7 cities where we can rate Black-Tailed Bumble Bee sightings, Portland has the highest daily chance: about 20%. Next come Seattle (United States, about 20%) and Sacramento (United States, about 20%).
Same genus: Bombus
The closest relatives of the Black-Tailed Bumble Bee that you can see in Portland (genus Bombus, Bumble Bees) are Yellow-Faced Bumble Bee (about 20%), Fuzzy-Horned Bumble Bee (about 10%) and California Bumble Bee (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Black-Tailed Bumble Bee is recorded against all the insects logged in Portland (725 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.
