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 Post subject: Plumage & Moult. A Photo Gallery
PostPosted: January 19th, 2011, 9:54 pm 
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Plumage & Moult

"Age determination is quite tricky sometimes, because individual variation is wide. As WtEs mainly moult (change the feathers) every year from spring up to autumn - it is better to determine in our case the age in winters (not in years). They do not change all the feathers once, also not every feather every year, but main moulting time is during the warm season.

The eagles born in May 2010 are not one year old during their first winter, yet. And, for example, eagles born in 2007 are not four years old, yet - but their age we write 1w (first winter bird) or 4w (fourth winter bird), respectively.

Also ageing in calendar years is not good, because we need then to add one year at 1st of January, though no remarkable changes in feathering... Calendar years are good to use in summer for example."

Text by Urmas Sellis, Eagle Club
Picture upload by Looduskalender forum member Mutikluti

Additional information: How old is the Golden Eagle. Text and photos by Bird Club Leksand
http://www.leksandsfagelklubb.se/projek ... aging.html


Scroll down the page to find a choice of pictures with explanations on this subject below. Kotkaklubi members will provide photographs for this topic.


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 Post subject: Re: Plumage & Moult
PostPosted: January 19th, 2011, 9:54 pm 
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Kotkaklubi/Eagle Club

"The Eagle Club is a non-governmental organisation whose members have studied, observed and protected eagles for decades.

Currently, the Eagle Club comprises 25 members who occupy themselves with research on eagles and black stork and their protection in Estonia. They include both specialists in ornithology and nature conservation, foresters, and also enthusiasts of nature and eagles protection.

It is possible to join the Eagle Club only if the active members unanimously approve a new member’s nomination. The activities of the Eagle Club are coordinated by a managing board which consists of three members. Although the activities of the Eagle Club are voluntary, they are financially supported by various projects. Members of the Eagle Club can be found almost everywhere in Estonia. The Eagle Club has coordinators in every county, who deal with the more urgent local problems." Read more: http://www.kotkas.ee/ENG/club.html

Text by Kotkas.ee ® 2007

If you live in Estonia and if you have observation data regarding a family of eagles or you happen to find unusually large nests of accipitridae, do not hesitate to contact Kotkaklubi.


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 Post subject: Re: Plumage & Moult
PostPosted: January 19th, 2011, 9:54 pm 
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Further Reading

The plumages of the White-tailed Eagle under the influence of individual and geographic variation

Flight feather moult of White-tailed Eagle (Haliaeetus albicilla) in Schleswig-Holstein, Germany

Raptor Moult Patterns and Age Criteria
    By Carl Edelstam, pp. 50-53; see also: pp. 402-406: White-tailed Fish-Eagle. Both articles in: Raptors of the world. Text Copyright 2001 by James Ferguson-Lees,David A. Christie. Online available. Go to Google/Books; type "Raptors of the world" into the search mask

Patterns of moult in large birds of prey
Carl Edelstam, 1984. Ann. Zool. Fennici 21:271-276
Page 4 (274): Upper aspect of a Scandinavian White-tailed Eagle in his first, second and third winter
Page 5 (275): Moult in the White-tailed Eagle
http://www.sekj.org/PDF/anzf21/anzf21-271-276.pdf


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 Post subject: Re: Plumage & Moult
PostPosted: January 19th, 2011, 10:47 pm 
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 Post subject: Re: Plumage & Moult. A Photo Gallery
PostPosted: October 24th, 2011, 5:46 pm 
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 Post subject: Re: Plumage & Moult. A Photo Gallery
PostPosted: October 24th, 2011, 5:47 pm 
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 Post subject: Re: Plumage & Moult. A Photo Gallery
PostPosted: October 24th, 2011, 5:48 pm 
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 Post subject: Re: Plumage & Moult. A Photo Gallery
PostPosted: February 17th, 2012, 8:18 pm 
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 Post subject: Re: Plumage & Moult. A Photo Gallery
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 Post subject: Re: Plumage & Moult. A Photo Gallery
PostPosted: February 17th, 2012, 8:19 pm 
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 Post subject: Re: Plumage & Moult. A Photo Gallery
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 Post subject: Re: Plumage & Moult. A Photo Gallery
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 Post subject: Re: Plumage & Moult. A Photo Gallery
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 Post subject: Re: Plumage & Moult. A Photo Gallery
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 Post subject: Re: Plumage & Moult. A Photo Gallery
PostPosted: February 17th, 2012, 8:21 pm 
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 Post subject: Re: Plumage & Moult. A Photo Gallery
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 Post subject: Re: Plumage & Moult. A Photo Gallery
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 Post subject: Re: Plumage & Moult. A Photo Gallery
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