Staff at St John's Shopping Centre in Liverpool staff are keeping busy with their rooftop tenants.
The programme to help the Moss carder species will focus on Cornwall, Kent and the North Pennines.
Hummingbird hawk moths - often mistaken for small birds - are being spotted in the West Midlands.
Incredibly rare habitats would be destroyed, the Essex Wildlife Trust warns.
Bee keepers and inspectors used GPS trackers to follow the insects and find the nest in Oldham.
The nest in La Guet may have had 2,000 insects in it, pest experts say.
The UK's bee population is already declining due to disease, pollution, and invasive species.
