sub-adult: August
Last update of this page: 07-12-03 17:33
Regarding moult pace and strategy, sub-adults don't differ much from full adults. Sometimes it's hard to age sub-adults correct, but on average, some or all of the following features can be found in 4cy:
- relatively pale bare part coloration compared to full adults,
- black markings on the old rectrices, often isolated limited black spots near the centre,
- p10 with a small mirror, p9 lacking such a mirror and very small white tips on the top of the outer primaries. By August, these tips are worn away and the primaries are brownish, strongly bleached,
- the grey centres of the old secondaries show a brown hue and the tips are abraded,
- tertials, outer greater coverts or outer lesser coverts (in the carpal edge) show old adult-like feathers with a relative strong brown hue, obvious much stronger than expected in full adult coverts.
Used as a single characteristic, the evidence is not very convincing, but individuals that combine these characteristics are probably 4cy or 5cy birds.
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sub-adult LBBG: Dutch intergrade |
LBBG
5cy ACAR, August 15 2003, Westkapelle, the Netherlands. |
LBBG
5cy AMAK, August
01 2003, Zeebrugge, Belgium. |
LBBG
5cy BBAF, August 01 2003, Zeebrugge, Belgium. |
LBBG
5cy BLAR, August
01 2003, Zeebrugge, Belgium. |
LBBG
4cy L-87262, August
01 2003, Zeebrugge, Belgium. |
LBBG
4cy L-92876, August
01 2003, Zeebrugge, Belgium. |
sub-adult LBBG: unringed birds |
Photo
1: LBBG sub-adult, August 18 2001, Missouriweg Maasvlakte, the Netherlands. |
Photo
2: LBBG sub-adult, August 18 2001, Missouriweg Maasvlakte, the
Netherlands. |
Photo
3: LBBG sub-adult, August 22 2002, Missouriweg Maasvlakte, the
Netherlands. |
Photo
4: LBBG sub-adult, August 22 2002, Missouriweg Maasvlakte, the
Netherlands. |
arrested
moult in sub-adult LBBG
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Photo
5: LBBG
sub-adult, August
15 2003, Westkapelle, the
Netherlands.
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