Bombus crotchii
In 3 days ~10% in a week ~30%
Bombus crotchii, commonly called Crotch's bumble bee or the Golden State bumble bee, is a species of bumblebee named after the entomologist George Robert Crotch. It is classified as endangered due to the impacts of pesticides, climate change, and human development.
Crotch's bumble bee is characterized as a short- or medium- tongue length species. This species could be confused with Bombus californicus or Bombus occidentalis, as they have color patterns similar to Crotch's bumble bee.
Queens and workers (females) have a black head and thorax, with yellow on the dorsal anterior thorax, and sometimes yellow on the scutellum. The first metasomal tergum (T1) of the abdomen is all black or black in the middle portion. T2 is usually yellow, sometimes black medially. T3-5 are black or orange and T6 is black. Queens and workers have a similar appearance, with the main difference being their body size. Queens are 23–24mm long and workers are 14–18mm long.
Males have a slightly different appearance from queens and workers. Their eyes are very large, occupying much of the face. They display yellow hair on their faces, and a broad black stripe mid thorax. The front of the male... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Los Angeles | 🇺🇸 United States | |
| 2 | Sacramento | 🇺🇸 United States | |
| 3 | San Diego | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Crotch's Bumble Bee sighting in Sacramento on a given day, based on 15 verified sightings from GBIF citizen-science data. It is the 184th most-seen of the 386 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.
April to July
In those months about 10% of wildlife watchers report a Crotch's Bumble Bee in Sacramento on a given day, against under 5% in August to March, the lowest months. Those are among Sacramento's driest months, with about 20 mm of rain a month against 120 mm in December.
Among the best
Of the 3 cities where we can rate Crotch's Bumble Bee sightings, Sacramento ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Los Angeles (United States, under 5%).
Same genus: Bombus
The closest relatives of the Crotch's Bumble Bee that you can see in Sacramento (genus Bombus, Bumble Bees) are Black-Tailed Bumble Bee (about 20%), Van Dyke's Bumble Bee (about 10%) and Yellow-Faced Bumble Bee (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Crotch's Bumble Bee is recorded against all the insects logged in Sacramento (15 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.
