Sparrow building a nest.
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Nuthatch
Full Flickr version: Canon 6D, Canon EF 100-400L ƒ4.5-5.6 IS USM, at 400mm, ISO100, 1/400, ƒ/10
Starling feeding its younger with millberry
Full Flickr version: Canon 6D, Canon EF 100-400L ƒ4.5-5.6 IS USM, at 400mm, ISO2000, 1/320, ƒ/5.6
European nuthatch in the nest
Full flickr version: Canon 6D, Canon EF 28-105 ƒ3.5-4.5 USM, at 105mm, ISO2500, 1/400, ƒ/5.6