Coordinator:
Greg Neubauer
Marcin Przymencki
Albert de Jong
Mars Muusse
Home
cachinnans PDF
cachinnans in Poland
cachinnans in Holland
cachinnans rings
cachinnans plumages
1cy August
1cy September
1cy October
1cy November
1cy December
2cy January
2cy February
2cy March
2cy April
2cy May
2cy June
2cy July
2cy August
2cy September
2cy October
2cy November
2cy December
3cy January
3cy February
3cy March
3cy April
3cy May
3cy June
3cy July
3cy August
3cy September
3cy October
3cy November
3cy December
sub-adult January
sub-adult February
sub-adult March
sub-adult April
sub-adult May
sub-adult June
sub-adult July
sub-adult August
sub-adult September
sub-adult October
sub-adult November
sub-adult December
adult January
adult February
adult March
adult April
adult May
adult June
adult July
adult August
adult September
adult October
adult November
adult December
|
Larus cachinnans 2cy, 14 March 2012, Texel, the Netherlands. Picture: Herman Bouman.
Contrastingly patterned bird.
below: same picture, with arrows to explain moult to 2nd gen feathers. Scorings as per table 2.
1. so-called "scapular covert". Often replaced late in the sequence. Here, still juvenile, faded brown and worn at fringes.
2. tertial #1: new 2nd gen. Tertials 2-5 also visible, which are still juvenile. (Moult: tertials = 1 new = trait score 2).
3. arrow points to 2nd gen feathers in the 'lesser covert region'. Pale brown feathers with a thin white fringe are juvenile feathers.
4. arrow points to 2nd gen feathers in the 'median covert region' (MC). Pale brown feathers with a thin white fringe are juvenile feathers: MC 1 juv, MC 2-9 2nd gen, MC 10-13 juv. MC 13 is last visible. (Moult: median coverts = measured as 8/13 = 60% of visible feathers, is category 51-75%; = trait score 1). However, the wing continues underneath the flank feathers, and the outer MC, not visible here, are most probably also juvenile, which brings down the measurement to only 44% (category 34-50%), and as trait score of 2.
5. arrow points to 2nd gen feathers in the 'greater covert region' (GC). GC 1-3 2nd gen, GC 4-15 juv. GC 15 is last visible. (Moult: greater coverts = measured as 3/15 = 20% of visible feathers, is category 10-33%; = trait score 3).
|