When Europeans first colonised Western Australia Welcome Swallows were confined to coastal areas. As land clearing progressed they spread further inland and northwards. They differ from their Eastern State cousins in that they are not migratory. They have readily adapted to human habitation and can be easily found in urban areas. To thrive they require substantial insect populations and large flocks can be commonly found near water. They are often seen perching on fences and overhead power lines. They nest in a cup shaped structure made by both parents from mud and grass and is lined with feathers and fur. This typically takes between 8 and 23 days to make. The nests are often attached to walls, rafters, cranes, bridges, rock faces, and dead trees.The monogamous pairs will re-use their old nest. A warming climate has meant that Swallows in Western Australia are having 2-3 broods per year and lay a clutch of up to 5 eggs. The female incubates the eggs for around 3 weeks and when they hatch they are fed by both parents. The young fledge after a further 3 weeks and become independent after 35 days.