Typical swarm locations
Collectors attend swarms on the gorse and rough ground of the headland above the Brough of Birsay tidal causeway, in the stone-dyke enclosures and sheltered gardens of the palace village properties, in the stone farm buildings and windbreak belts of the inland farms between Birsay and Evie, and on the coastal machair-type grassland of the Bay of Birsay shore.