Barn Swallows Gathering Thing Long Dry Switches in a Beak For Nest Building and Fly Away

barn swallows hirundo rustica swallows gather switch closeup behavior couple two ground dry branches sticks beak brushwood straws small twigs thin short birds static hill slope spring pick nest building wildlife nesting carrying tiny twig little barn swallow wild ornithology collecting hirundo hirundinidae house martin action building nest flying away slow motion stems grass