Gavin Hellier / Cobbled street lined with colourful houses known as Kujundziluk, one of the oldest streets in Mostar leading to the Old Bridge, Old Town, Mostar, Herzegovina, Bosnia and Herzegovina, Balkans, 2007. No...

Mark Hamblin / 2020VISION / Barn swallow (Hirundo rustica) collecting mud for nest building, June, Scotland, UK

Mark Hamblin / 2020VISION / Barn Swallow (Hirundo rustica) alighting at pool to collect mud for nest building. Inverness-shire, Scotland, June .Did you know? Due to the distances that Swallows travel, it was traditional for sail...

Roy Mangersnes / Black-legged kittiwakes (Rissa tridactyla) on an old building including one landing, Finnmark, Norway, April

Mark Hamblin / 2020VISION / Barn swallow (Hirundo rustica) collecting material for nest building, Scotland, UK, June

Mark Hamblin / 2020VISION / Barn swallow (Hirundo rustica) alighting at pond, collecting material for nest building, Scotland, UK, June. Did you know? Barn swallows will feed their nestlings up to 400 times every day.

Carol Walker / Horse in snow storm with shed in background, USA

Bernard Castelein / Village life, woman covering her face, in doorway to village home, with peacock art on walls, Sawai Modhopu, Rajasthan, India

Bertie Gregory / 2020VISION / Peregrine falcon (Falco peregrinus) chicks at nest on building, London, England, UK, May 2011

Konrad Wothe / Mute Swans (Cygnus olor) in front of the Alsterarkaden. Hamburg, Lower Saxony, Germany, Europe, November.

Ernie Janes / House sparrows (Passer domesticus) perched on building, Morocco, March

Patricio Robles Gil / Pale-legged Hornero (Furnarius leucopus) male and female birds building their mud nest on a branch. Parana, Southern Brazil.