Insects diurnal

Crotch's Bumble Bee

Bombus crotchii

The 'Golden State' bumble bee is a vibrant, endangered treasure of the California landscape. With its fuzzy orange tail and industrious spirit, it is a master pollinator of the West's most beautiful wildflowers.

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Quick Identification

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Size

Queens 16–22 mm (0.6–0.85 in); Workers 12–18 mm (0.45–0.7 in); Males 14–18 mm (0.55–0.7 in)

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Colors

Predominantly black with yellow on the thorax; abdomen features yellow, black, and a distinctive reddish-orange tip on segments 5 and 6.

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Key Features

Distinctive reddish-orange or gold tail segments
Short, square-shaped head with a black face
Large, robust body with dense, velvety hair
Yellow band on the front of the thorax that does not extend past the wing bases

When You’ll See Them

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Activity pattern diurnal

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Peak hours 9:00 AM – 3:00 PM

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Season March – August

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Diet A generalist nectar and pollen feeder with a strong preference for native California plants such as lupines, buckwheats, California poppies, and milkweeds.

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Habitat Open grasslands, coastal scrub, and chaparral, including suburban gardens that prioritize native drought-tolerant landscaping.

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Behavior

Crotch's Bumble Bee is a social insect with a life cycle deeply tied to the Mediterranean climate of the American West. Unlike many other bees, they are ground-nesters, frequently repurposing abandoned rodent burrows or tucking themselves into the base of bunchgrasses to establish their colonies. The queen emerges in early spring to find a site, while her workers take over foraging duties through the heat of the summer.

These bees are masters of 'buzz pollination,' a technique where they vibrate their flight muscles at a specific frequency to dislodge pollen from stubborn flowers like nightshades. While they are docile and rarely sting unless their nest is directly threatened, they are highly sensitive to environmental changes. Their behavior is characterized by a high degree of floral constancy, meaning an individual bee will often visit the same species of flower repeatedly during a single foraging trip.

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Camera Tips

To capture high-quality footage of Crotch's Bumble Bee, you must think small and focus on 'landing zones.' Set your AI camera on a tripod or mount just 6 to 12 inches away from a cluster of their favorite native blooms, such as Lupinus or Eriogonum. Because these bees move rapidly between flowers, a side-angle view is often better than a top-down view, as it allows the camera to capture the distinctive orange tail and the yellow bands on the thorax that are critical for identification.

Lighting is your best friend and your worst enemy. Since these bees are active during the brightest parts of the day, choose a spot that receives 'dappled' sunlight or use the camera’s exposure compensation to avoid blowing out the yellow highlights on the bee's back. Early morning (around 9:00 AM) offers the best balance of active foraging and soft, golden light that catches the iridescence of their wings and the texture of their fuzz without harsh shadows.

Technically, you should prioritize a high frame rate. If your camera supports 60fps or higher, use it; this reduces motion blur when the bee is hovering or vibrating. Use a 'Macro' mode if available, or ensure your fixed-focus camera is at the manufacturer's minimum focal distance for maximum clarity. If you are using a trail camera with a trigger, set the sensitivity to 'High' and the burst mode to 3-5 photos to ensure you catch the insect while it is still in the frame.

Finally, avoid using artificial lures or sugar water, which can disrupt their natural foraging patterns. Instead, 'bait' the area naturally by planting a diverse array of native California wildflowers. If you are specifically looking for the queen, aim your camera low to the ground near woodpiles or tall grass margins in early March, as she will be scouting for nesting sites at foot-level before the rest of the colony emerges.

Similar Species

Species that look similar or are commonly confused with Crotch's Bumble Bee.

Yellow-faced Bumble Bee

Has a yellow patch of hair on its face, whereas Crotch's has an entirely black face on queens and workers.

Black-notched Bumble Bee

The yellow on the thorax extends further back, and it lacks the specific reddish-gold tail segments found on Crotch's.

Nevada Bumble Bee

Features a much longer cheek and head shape compared to the short, square head of Crotch's.

Frequently Asked Questions

Crotch's Bumble Bee is strictly diurnal, with peak activity occurring during the warmest parts of the day, typically between 9:00 AM and 4:00 PM, when flowers are most likely to provide nectar.

The best way to attract this species is to plant native California flora. Focus on milkweed, lupine, and buckwheats, and provide undisturbed ground or bunchgrass for potential nesting sites.

They are generalist foragers that eat nectar for energy and pollen for protein. They have a particular affinity for native plants like California Poppies, Phacelia, and Sage.

While their populations are declining and they are listed as endangered, they can still be found in suburban areas that maintain 'wild' corridors and gardens with native, pesticide-free plants.

Look for the orange/red tip on the abdomen and the black face. Unlike the Yellow-faced Bumble Bee, Crotch's has a shorter head and the yellow on its thorax does not extend as far back.

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