Regulus cristatus; Print; The goldcrest (Regulus regulus) is a very small passerine bird in the kinglet family. Its colourful golden crest feathers; as well as being called the "king of the birds" in European folklore; gives rise to its English and scientific names. The scientific name; R. regulus; means king or knight. Several subspecies are recognised across the very large distribution range that includes much of Eurasia and the islands of Macaronesia and Iceland. Birds from the north and east of its breeding range migrate to winter further south.; 1839