What is the most common type of nesting site utilized by the hosts of Bombus bohemicus underground?
Answer
Abandoned rodent burrows
The success of the Gypsy Cuckoo Bumble Bee relies entirely on the quality of its host's nesting infrastructure. The text specifies that the preferred nesting sites for the host species, which *B. bohemicus* subsequently invades, are most commonly found in abandoned rodent burrows beneath the ground surface. They can also be found in dense grass tussocks or thick ground vegetation, but the underground burrow remains the primary and most sought-after location for establishing the nest structure that the parasitic queen targets.

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