Carduelis spinus - spring

Eurasian Siskin / Grönsiska

AGE - BEST CRITERIA:

Autumn criterias are still applicable, though 2cy are more affected to wear during the winter than adult. Moult contrast present in the wing of 2cy, often in the central GC (but very variable, and rarely all GC may be moulted) and sometimes also in RR and tertials. Adult birds show a uniform plumage in relatively good condition.

2cy: 
  • Nearly always show moult contrast in the GC, commonly in the central or outer part of the arm: Less worn post-juvenile inner GC are denser, longer, show a darker (blackish) centre and wider and more yellow tips than the more worn juvenile outer GC that often show loose, more narrow and pale yellowish-buff tips and a paler grey centre. A few show less extensive moult and the contrast may then be hidden under the scapulars. Rarely, all GC may be moulted, and the contrast is then found towards the still juvenile PC.
  • Juvenile RR are on average more pointed and worn than adult ones, but wear sometimes makes this less easy to judge. Many individuals have moulted single or several RR and then exhibit moult contrast among RR. According to Jenni & Winkler (1994) a few individuals may have included the whole tail in the post-juvenile moult, but reasonably more common in southern populations. 
  • 0-3 tertials were included in the post-juvenile moult. Post-juvenile tertials are less worn and show a darker (blackish) centre and often more colourful yellow and white edges/tips than the more worn and slightly paler grey juvenile ones, with more narrow and yellowish-white edges.
  • Juvenile PC are generally more worn, less dense and slightly more brownish-grey than adult ones.
 
2cy+:
  • Uniform plumage lacking any moult contrast.
  • Whole wing and tail in better condition with denser feathers and better gloss.
  • Tips of RR generally slightly more blunt and broader.
2cy (male) March. GC1-7 are juvenile (slightly shorter, more worn, paler brownish-grey centre and with narrow yellowish-buff tips), in contrast to post-juvenile GC8-10 (longer, less worn, darker centre and with wider and brighter yellow tips) as well as to MC. [CV55239]
2cy (female) April. GC1-3 are juvenile in contrast to post-juvenile GC4-10 as well as to MC. [CT50917]
3cy+ (male) May. Whole wing uniform post-breeding. Blackish GC with wide deep yellow tips. [CV03415]
3cy+ (female) April. Whole wing uniform and fresh post-breeding. Note that female show alightly duller colour in wing than males. [CT50918]
2cy (male) March. A uniform juvenile tail. Tips to RR may be slightly more blunt than seen during autumn, due to wear, but still show a rather typical juvenile quality. [CV55239]
2cy (female) April, showing variation. [CT50917]
3cy+ (male) April. Whole tail uniform post-preeding, in good contidion. Note blunt tips, dense structure and bright clear-cut colouration. [CP43980]
3cy+ (female) April. Whole tail uniform and (comparatively) fresh post-preeding. Not the rather broad and blunt-tipped RR. [CT50918]
2cy (male) March. All tertials are juvenile, but still in rather good condition due to the early date. Note that quite many 2cy show a moult contrast in the tertials, or may even show an all post-juvenile set. Such feathers inseparaple from the adult ones shown below. [CV55239]
2cy (female) April. All tertials are worn juvenile, and much of the yellowish-buff tips have worn off. Note that quite many 2cy show a moult contrast in the tertials, or may even show an all post-juvenile set. Such feathers are in better condition and shows a pattern similar to the adult ones below. [CT50917]
3cy+ (male) April. Uniformly post-breeding tertials (as well as SS and GC). Note the generally good condition, the dark centre and the vividly yellow and white edges/tips. [CP43980]
3cy+ (female) April. Females are generally less colourful, but the tertials are still in more dense and in better condition compared to juvenile ones. [CT50918]
More Carduelis spinus:
Sexing autumn and spring
Ageing autumn

Moult
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