Particle swallows were named after their breeding grounds. They spend and raise their chicks in holes carved into the earth walls.
Natural earth walls promise party swallows the opportunity to spend calmly and safely, but they could easily try to spend in a place that could be dangerous to them. The Hungarian Ornithological and Nature Conservation Association also draws the attention of the builders to this. The accumulation of raw materials needed for construction can also entice party swallows to live. By disturbing the mounds, the spawning of swallows can also be endangered, so birds must be prevented from nesting there. It is recommended to cover the mounds with foil.
(Source: kotikedvenc.co.hu | pictures: https://flic.kr/p/w7BgwL, https://flic.kr/p/21Ri1tC | video: https://www.youtube.com/watch?v = bOyJanzvX3k)