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PISMENNYI K, VATRASEVICH R. 2007-2011. Mizhrichynskyi Park. Chernihiv Region

Photographing the same adult male Short-toed Eagle in the nature is an example of possible way to recognise individuals from one breeding season to another by the moulting of the biggest 14 wing feathers (4th-10th primaries); we call it “passive marking”. For comparing different photos we recommend to open images in new tabs or windows of your browser and then to switch between them.

15.VII.2007 : 6th right and 5th left primaries are moulting / by K. Pismennyi
15.VII.2007 : 6th right and 5th left primaries are moulting / by K. Pismennyi
24.VIII.2009 : 5th right and 6th left primaries are moulting / by K. Pismennyi
24.VIII.2009 : 5th right and 6th left primaries are moulting / by K. Pismennyi
15.VIII.2010 : 2 right (R4, R7) and 2 left (L5, L8) primaries are in the moulting process / by K. Pismennyi
15.VIII.2010 : 2 right (R4, R7) and 2 left (L5, L8) primaries are in the moulting process / by K. Pismennyi
02.IV.2011 (33 weeks later): all of the primaries are completely grown / by K. Pismennyi
02.IV.2011 : all of the primaries are completely grown; fresh ones look more greyish / by R. Vatrasevich
08.V.2011 (5 weeks later) : R5, R8, L4 seem to be absent / by K. Pismennyi
08.V.2011 : R5, R8, L4 seem to be absent / by K. Pismennyi
03.VII.2011 (8 weeks later) : R5, L4 are completely grown; R8, R10, L9 are growing / by K. Pismennyi
03.VII.2011 : R5, L4 are completely grown; R8, R10, L9 are growing; fresh ones look more greyish / by K. Pismennyi

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So, from 02.IV.2011 to 18.IX.2011, i.e. from the arrival to the departure of the Short-toed Eagle, 7 of the biggest 14 primaries (R5, R6, R8, R10 and L4, L7, L9) have been replaced by new ones. At the same time 7 others (R4, R7, R9 and L5, L6, L8, L10) haven’t been. And 4 of the last ones (R4, R7 and L5, L8) were in the moulting process in August, 2010. According to discrete observations since 2007 moulting of 2 feathers (L5, L6) hasn’t completely corresponded to the two-year cycle, whereas moulting of 2 others (R5, R6) has.

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