The Bogong moth (Agrotis infusa) migrates annually to the highest peaks in the Southern Alps where millions spend the hot summer months aestivating in deep, dark crevices in rock caves among granite boulders. Parliament House disrupts the flight of the moths, writes Bill McCormick, and acts as a giant light trap for moths migrating through the Canberra area during October and November. The moths treat the building as a temporary camp and it is often necessary to reduce the building's lighting to allow the moths to continue their migration south.