Appearance
The female is much larger than the male; she has a length of 20–25 mm, while the drone usually is not more than 16 mm. The bumblebee is black, with the last abdominal segments coloured orange-red.Due to its parasitic lifestyle, no workers exist.
Behavior
"Bombus rupestris" is found in flower-rich habitats, such as meadows and along hedgerows. The bumblebee parasitizes the nests of the red-tailed bumblebee, "B. lapidarius", whose queen is killed or subjugated.References:
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