The International Union for Conservation of Nature (IUCN) is the organisation responsible for assessing the conservation status of species.
A species is assessed as subject to varying levels of threat if it has a small, fragmented or declining range, or if the total population is less than 10,000 mature individuals, or if numbers have dropped rapidly (by more than 10% in ten years or three generations).
None of the three Delichon species meets these criteria, and three genus house martins are therefore considered of least concern.

The numbers of the two Asian species are unknown, but both can be locally abundant, and the Asian house martin is extending its range in southern Siberia.
The lowland breeding common house martin has greatly benefited from forest clearance, creating the open habitats it prefers, and from human habitation which has given it an abundance of safe man-made nest sites, although widespread declines in its numbers have been reported from central and northern Europe since 1970.
This is due to factors including poor weather, poisoning by agricultural pesticides, lack of mud for nest building and competition with house sparrows for nest sites.
Despite this, the huge geographical range and large numbers of the common house martin mean that its global status is secure.
The International Union for Conservation of Nature (IUCN) is the organisation responsible for assessing the conservation status of species. A species is assessed as subject to varying levels of threat if it has a small, fragmented or declining range, or if the total population is less than 10,000 mature individuals, or if numbers have dropped rapidly (by more than 10% in ten years or three generations). None of the three Delichon species meets these criteria, and three genus house martins are therefore considered of least concern.
The numbers of the two Asian species are unknown, but both can be locally abundant, and the Asian house martin is extending its range in southern Siberia. The lowland breeding common house martin has greatly benefited from forest clearance, creating the open habitats it prefers, and from human habitation which has given it an abundance of safe man-made nest sites, although widespread declines in its numbers have been reported from central and northern Europe since 1970. This is due to factors including poor weather, poisoning by agricultural pesticides, lack of mud for nest building and competition with house sparrows for nest sites. Despite this, the huge geographical range and large numbers of the common house martin mean that its global status is secure.
Delichon