Typical swarm locations
Collectors in Grimsby are regularly called to swarms in the chimney pots and lime mortar joints of the East Marsh Victorian terraces, on the dock-wall ivy at the Alexandra Dock perimeter, in the mature garden trees of Park and Nunsthorpe, and in the roof voids of older properties around Freeman Street and the Old Town. The oilseed rape fields south of Wybers Wood produce large spring colony build-up that can lead to early swarms from late April.