Birds of Indian Subcontinent

Age Determination of Goldcrests Regulus regulus (L.) in Summer and Early Autumn

Publication Type:Journal Article
Year of Publication:1971
Authors:Hogstad, O
Journal:Ornis Scandinavica
Date Published:1971
ISBN Number:00305693
Keywords:Regulidae, Regulus, Regulus regulus
Abstract:With the degree of ossification of skulls as a reference, it was found that Goldcrests with elements of yellow near the tip inside their mandibles were juveniles. Since the yellow colour disappears before the skull is completely ossified, it cannot be stated generally that specimens without traces of yellow are adults. The material suggests, however, that nearly all specimens from the period July-September having a uniform black colour inside their mandibles, are adults. It was also shown that all birds with a yellow and orange crest were males and all birds with only yellow crest were females.
Short Title:Ornis Scandinavica
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith