| Hej Knud !
Jeg prøver.
Det er jo nogle ringmærkningsrelaterede kendetegn baseret på fældning.
Lars Svensson skriver i Identification Guide to European Passerines
Ad,: SC, wp. - Young: sp, wp.
Adults have a complete summer (- autum) moult, but young birds only a partial one. Both ages have partial winter moults - e.g. many Anthus, Motacilla, Sylvia warblers and Emberiza. One of the two most frquently used strategies (the other being "Ad.:SC.- Young: sp"). Agening often possible in autumn and winter according to shape and wear of tail-feathers, and by completely or partially moulted greater coverts.
Eller på dansk; fugle til venstre har mere tilspidsede halefjer end fuglen til højre.
Hilsen Mikkel |