Why is the Bombus vestalis often found in suburban gardens and urban areas?

Answer

These environments are preferred by its host, Bombus terrestris

The habitat preference of the Bombus vestalis is entirely dictated by the habitat needs of its host, the Bombus terrestris. The host bee is known to be highly adaptable and frequently establishes nests in urban and suburban settings, such as gardens where the ground is undisturbed and floral resources are plentiful. Because the host is common in these developed zones, the parasite is also found in the same proximity. Observers looking for the Bombus vestalis should focus on areas rich in spring forage and undisturbed cavities, as these are the exact locations that favor the host population and, by extension, allow the parasite to survive.

Why is the Bombus vestalis often found in suburban gardens and urban areas?
locationinsectbumblebeecuckooVestal