Drones, bumblebees, wasps, and butterflies knock awkwardly against the walls of the hive in their flight.
The pea family includes many wild flowers that are loved by bumblebees.
Perhaps the best single plant to attract bumblebees to your garden.
This year they were harassed by some yellow bumblebees; perhaps someone could tell us the species and the nature of the dispute?
Experiments have shown that some British garden bumblebees can return to a nest from distances over 6km.