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Great Spotted Woodpecker - juvenile (1 Viewer)
- Thread starter Mirta
- Start date
Bird Hard 2
Cynical Sceptic
There's lots about this on the internet:
"Partial post-juvenile moult, including body feathers, primaires, lesser and median coverts and tail, so greater coverts, primary coverts, secondaries and tertials remain unmoulted."
Source: www.ibercajalav.net/img/291_GreatSpottedWoodpeckerDmajor.pdf
Also:
"Postjuvenile moult features of the Great Spotted Woodpecker. - V.A. Kovalev. - Berkut. 5 (1). 1996. P. 39-43.
Young Great Spotted Woodpeckers have a full postjuvenile moult. It starts on 18-20 day of young nith changing of the tenth primaries. Early dates of moult are possible due to the size reduction of proximal primaries. The secondaries, tertials and the primary coverts are not change during the moult, as well as all or a part of greater and median secondary coverts, alula. From autumn to the next moult period, woodpeckers may be aged by contrast between moulted and retained juvenile coverts. Postjuvenile moult of different subspecies of Great Spotted Woodpeckers goes according to common scheme. In comparison nith the northern subspecies the southern ones change a little more number of feathers at the wing pterilium. The postjuvenile moult duration of Great Spotted Woodpeckers in northwestern Russia is 155-165 days. [Russian]."
Source: http://www.geocities.com/berkut_ua/SUM/51-6.htm
So, in summary, the have a post-juvenile moult that includes all the body feathers, so they will keep the full red cap until they moult at the end of the summer or during autumn.
"Partial post-juvenile moult, including body feathers, primaires, lesser and median coverts and tail, so greater coverts, primary coverts, secondaries and tertials remain unmoulted."
Source: www.ibercajalav.net/img/291_GreatSpottedWoodpeckerDmajor.pdf
Also:
"Postjuvenile moult features of the Great Spotted Woodpecker. - V.A. Kovalev. - Berkut. 5 (1). 1996. P. 39-43.
Young Great Spotted Woodpeckers have a full postjuvenile moult. It starts on 18-20 day of young nith changing of the tenth primaries. Early dates of moult are possible due to the size reduction of proximal primaries. The secondaries, tertials and the primary coverts are not change during the moult, as well as all or a part of greater and median secondary coverts, alula. From autumn to the next moult period, woodpeckers may be aged by contrast between moulted and retained juvenile coverts. Postjuvenile moult of different subspecies of Great Spotted Woodpeckers goes according to common scheme. In comparison nith the northern subspecies the southern ones change a little more number of feathers at the wing pterilium. The postjuvenile moult duration of Great Spotted Woodpeckers in northwestern Russia is 155-165 days. [Russian]."
Source: http://www.geocities.com/berkut_ua/SUM/51-6.htm
So, in summary, the have a post-juvenile moult that includes all the body feathers, so they will keep the full red cap until they moult at the end of the summer or during autumn.
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