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

Alan Murphy / Tree Swallow (Tachycineta bicolor) male, British Columbia, Canada

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

Ernie Janes / Swallow (Hirundo rustica) adult perched on swallow weather vane, England, UK, June.

Loic Poidevin / Barn swallow (Hirundo rustica) flying low over the ground, Indre-et-Loire , France, June.

Loic Poidevin / wo juvenile Barn swallows (Hirundo rustica)peched on a twig and begging for food, Indre-et-Loire , France, June.