Crotch's Bumble Bee
Bombus crotchii
Often called the 'Golden State' bee, this endangered pollinator is a rare gem of the California landscape. Its presence in your garden is a hallmark of a healthy native ecosystem.
Quick Identification
Size
Queens: 16–22 mm (0.6–0.9 in); Workers: 10–18 mm (0.4–0.7 in); Drones: 12–16 mm (0.5–0.6 in)
Colors
Predominantly black and yellow; thorax is mostly yellow with a distinct black patch or 'spot' between the wings; abdomen has yellow on the first segment and often orange-red near the tail.
Key Features
- Mostly yellow thorax with a central black square or spot
- Black face and head with short, velvety hair
- Abdomen segment 1 is entirely yellow
- Short tongue length compared to other bumble bees
When You’ll See Them
Geographic range
Where Does the Crotch's Bumble Bee Live?
Crotch's Bumble Bee is a quintessential resident of the American West, primarily native to the Mediterranean-climate regions of California. Its core range spans from the northern Central Valley down through the coastal hills and into the arid landscapes of Southern California. While it is most concentrated within the United States, its presence extends south across the border into the northern reaches of Baja California, Mexico. Once widespread, this species has seen significant range contraction and is now a rare sight in many of its former haunts.
Basemap © OpenStreetMap contributors
Behavior
Crotch's Bumble Bee is a social insect with an annual life cycle centered around a single queen. In early spring, usually around March, a lone queen emerges from her underground winter hibernation. Her first task is to find a suitable nesting site—often an abandoned rodent burrow or a hollow beneath dense vegetation—where she can begin laying eggs and foraging for nectar to sustain her first brood of workers.
Once the colony is established, the queen stays within the nest while her workers take over the foraging duties. These bees are known as 'generalists,' meaning they visit a wide variety of flowers, though they are particularly adapted to the native flora of California. They are generally non-aggressive toward humans, focusing their energy on the labor-intensive task of collecting pollen to feed the developing larvae. By late summer, the colony produces new queens and males to mate, after which the original colony and the males die off, leaving the new queens to carry the lineage into the next year.
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Camera Tips
To successfully capture Crotch's Bumble Bee on an AI-powered camera, placement is everything. You should position your camera directly facing high-value native nectar sources. In California, planting Milkweed (Asclepias) or California Poppies (Eschscholzia californica) creates a natural 'stage' for the bees. Set your camera on a tripod or mount it 12 to 18 inches away from the blooms, angling it slightly upward to catch the underside and the thorax markings, which are critical for identification.
Because bumble bees move quickly, use a camera setting with a fast shutter speed or a dedicated 'macro' focus mode if available. These bees are most active when the sun is high and temperatures are between 60°F and 80°F. Early morning shots can also be successful as the bees move more slowly while 'warming up' their flight muscles. Ensure the area is well-lit; the golden hairs on the thorax can reflect light beautifully, but deep shadows can obscure the black spot that identifies this species.
Avoid using artificial lures or sugar water, which can disrupt their natural foraging patterns. Instead, focus on 'passive baiting' by maintaining a pesticide-free garden with a variety of blooming plants throughout the spring and summer. If you are using a trail camera in a wilder setting, look for south-facing slopes with sandy soil, as these are preferred locations for the underground nesting sites where queens emerge in the spring.
Similar Species
Species that look similar or are commonly confused with Crotch's Bumble Bee.
Frequently Asked Questions
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