Swallows: Hirundinidae

There is one Critically Endangered, facing an extremely high risk of extinction, species of swallow, the white-eyed river-martin. There are estimated to be fewer than fifty adults of the species, and the bird, which is native to Thailand, has not been sighted in twenty years and therefore may already be extinct. Their decline has been caused by hunting, habitat destruction, and deforestation.

Four species classified as Vulnerable, facing a high risk of extinction, are also noted by the World Conservation Union (IUCN): the blue swallow, white-tailed swallow, Bahama swallow, and golden swallow. Habitat loss due to deforestation and agricultural land use has been particularly destructive to cavity nesting and grassland-dwelling swallows.