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The female is much larger than the male; she has a length of 20–25 mm (0.79–0.98 in), while the drone usually is not more than 16 mm (0.63 in). The bumblebee is black, with the last abdominal segments coloured orange-red.
Due to its parasitic lifestyle, no workers exist.
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.
- "Bombus rupestris (Fabricius, 1793)". Biolib.cz. Retrieved 4 July 2012.
- Discover Life. "Discover Life map of Bombus rupestris". Retrieved 28 February 2009.
- Jim Lindsey (retired professor of Biostatistics). "Bombus rupestris". Retrieved 28 February 2009.[dead link]
- Dr Brian Nelson, Ulster Museum. "Bombus (Psithyrus) rupestris – a cuckoo bumblebee". National Museums Northern Ireland. Retrieved 28 February 2009.
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