garden wildlife, bluetits, cyanistes caeruleus, in flight building a nest of moss and twigs

animal beak bird birdwatching blue bluetit box branch building caeruleus cyanistes environment eurasian fauna feathers forest garden habitat house mating moss natural nature nest nesting ornithology outdoors park parus passerine perched perching plumage reproduction singing songbird spring tit titmouse town tree twig urban wild wildlife woodland