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Canon 6D, Canon EF 100-400L ƒ4.5-5.6 IS USM, at 400mm, ISO6400, 1/320, ƒ/6.3

The goldcrest is a very small passerine bird in the kinglet family. Its colourful golden crest feathers gives rise to its English and scientific names, and possibly to it being called the "king of the birds" in European folklore. Wikipedia