Andres M. Dominguez/ BIA / Common Tern (Sterna hirundo) flying with fish prey, Danube Delta, Romania

Pedro Narra / Barn Swallow (Hirundo rustica) in flight. Portugal, Europe

Dave Bevan / Pair of Sand martins (Riparia riparia) feeding chicks, Carmarthenshire, Wales, UK, July.

Dave Bevan / Swallow (Hirundo rustica) feeding juveniles perched on a rope near nest in a barn, Carmarthenshire, Wales, UK, September.

Dave Bevan / Pair of Swallows (Hirundo rustica) feeding chicks at nest in a barn, filmed using infra red, Carmarthenshire, Wales, UK, September.

Dave Bevan / Slow motion clip of a Swallow (Hirundo rustica) flying into a barn in heavy rain, Carmarthenshire, Wales, UK, September.

Ole Jorgen Liodden / Barn swallow (Hirundo rustica) in mud collecting nesting material, collecting nesting material, with golden bokeh affect in puddle, Svalbard, Norway, June.

Alan Murphy / Cave Swallow (Hirundo fulva) male flying, Texas

Markus Varesvuo / Swallow (Hirundo rustica) flying low over water, Israel, March

Markus Varesvuo / Rock Martin (ptyonoprogne fuligula)in flight, Israel

Markus Varesvuo / Barn swallow (Hirundo rustica) chick on branch begging adult for food. Sipoo, Finland.

Bence Mate / Barn swallow (Hirundo rustica) mobbing Euasian Kestrel (Falco tinnunculus) Pusztaszer, Hungary, June.