Stock Photo - 28 May 2022, Brandenburg, Groß Neuendorf: A House Martin (Delichon urbica) builds a nest on the ceiling of a house. House martins build round and almost closed clay nests on buildings, roof or facade projections. The House Martin is endangered: Their population is steadily declining. In Thuringia, there is now a ""Swallows Welcome!"" campaign by the Nature and Biodiversity Conservation Union (Nabu). Photo: Patrick Pleul/dpa. - Groß Neuendorf/Brandenburg/Germany

Stock Photo: 28 May 2022, Brandenburg, Groß Neuendorf: A House Martin (Delichon urbica) builds a nest on the ceiling of a house. House martins build round and almost closed.

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