2 articles 2004-2005

PROJECTED MODEL of the plumage changing for the SHORT-TOED EAGLE (CIRCAETUS GALLICUS)

↓ 2nd ver., correction based on:
• Campora M., Cattaneo G., 2005 – Ageing and sexing Short-toed Eagles // British Birds, 98 : 370-376;
• Pavón D., Limiñana R., Urios V., Izquierdo A., Yáñez B., Ferrer M. & de la Vega A., 2010 – Autumn migration of juvenile Short-toed Eagles Circaetus gallicus from southeastern Spain // Ardea, 98 (1) : 113–117.
calendar year » 1 2 3 4 5 6…
jan I II (I) II III (II) III
feb I II (I) II III (II) III
mar I»II II (I) II III (II) III
apr I»II II (I»II) II»III III (II»III) III
may I»II II (I»II) II»III III (II»III) III
jun birth I»II II (I»II) II»III III (II»III) III
age, years » 0 ↓ 1 ↓ 2 ↓ 3 ↓ 4 ↓ 5… ↓
jul »I I»II II (I»II) II»III III (II»III) III
aug »I I»II II (I»II) II»III III (II»III) III
sep I I»II II (I»II) II»III III (II»III) III
oct I I»II II (I»II) II»III III (II»III) III
nov I II (I) II III (II) III III
des I II (I) II III (II) III III

month
proved partial summering
in the wintering regions (%-?)
maturity

↓ 1st ver., based on:
• Cramp S., Simmons K.E.L. (Eds.), 1980 – The Birds of the Western Palearctic. – Vol. 2. – London: Oxford University Press. – 695 p.;
• Forsman D., 1999 – The Raptors of Europe and the Middle East. – London: Poyser. – 589 p.
calendar year » 1 2 3 4 5 6…
jan I II (I) III (II) III III
feb I II (I) III (II) III III
mar I»II II (I) III (II) III III
apr I»II II»III (I»III) III (II»III) III III
may I»II II»III (I»III) III (II»III) III III
jun birth I»II II»III (I»III) III (II»III) III III
age, years » 0 ↓ 1 ↓ 2 ↓ 3 ↓ 4 ↓ 5… ↓
jul »I I»II II»III (I»III) III (II»III) III III
aug »I I»II II»III (I»III) III (II»III) III III
sep I I»II II»III (I»III) III (II»III) III III
oct I I»II II»III (I»III) III (II»III) III III
nov I II (I) III (II) III III III
des I II (I) III (II) III III III

month
possible partial summering
in the wintering regions (%-?)
maturity

Unique [typical] characters of the plumage types Explanatory notes
I – dense reddish extensive “hood”; reddish blurred not crosswise spots on belly, breast and flanks;
[secondaries without top dark bar; absent or pale marks at tops of under coverts of primaries and secondaries;] … else?
I, II, III – types of plumage with certain unique characters
I»II – replacement of one plumage type by another while moulting
II – whitish head from above with dark long-drawn sharper marks or completely without them; contrast of head and mantle; central thin lengthwise darker parts of the spots along quills of the belly, breast and flanks feathers are more clear-cut;
[secondaries without top dark bar; absent or pale marks at tops of under coverts of primaries and secondaries;] … else?
(I) – existence of some feathers of previous type partly remained after last moulting
(I»III) – replacement of partly remained feathers by new ones while moulting
III – wide dark bar at tops of secondaries; sharp greyish dark marks at tops of under coverts first of all of primaries and also of secodaries; more greyish in general; sharp crosswise bars on belly, breast and flanks;
[dark head from above, no contrast with mantle] … else?
       – spread in time for the beginning and the ending of moulting is shown by wide bluish left and right borders
  – general changing of the plumage colouration according to periods of more and less intensive moulting is shown by different colours
At the same time every plumage has high individual variability in quantity (but not in shape and in colouration) of dark marks on different parts of body … else?

One Response to “PROJECTED MODEL of the plumage changing for the SHORT-TOED EAGLE (CIRCAETUS GALLICUS)”

  1. Admin says:

    Comments may be written in any language. It would be excellent if they contain references to printed articles and/or to personal observations. Photos illustrating the plumage characters are planned to be added.

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