Links related to posts where there are some comments about the subject.

Ageing and sexing 1w Goosanders (Mergus merganser)
First-year female Kestrel (Falco tinnunculus) in September
Eurasian Coot (Fulica atra) in winter
- Adult Bar-tailed Godwit (Limosa lapponica) in July
- Dunlin (Calidris alpina) in summer
- Red Knot (Calidris canutus) in summer
- Curlew Sandpiper (Calidris ferruginea) in summer 
Scops Owl (Otus scops) in spring
Little Owl (Athene noctua) in summer
- Some things about Woodpigeons (Columba palumbus)
Hoopoe (Upupa epops) in spring
European Bee-eater (Merops apiaster) in summer
Second-year Kingfishers (Alcedo atthis) with retained flight feathers
- Juvenile European Green Woodpecker (Picus viridus viridis) vs Iberian (P.v.sharpei)

- 2nd-year Woodchat Shrike (Lanius senator) in July
2nd-year White Wagtail (Motacilla alba) in June
- Thrush Nightingale (Luscinia luscinia)
Bluethroats (Luscinia svecica) in autumn
Common Redstarts (Phoenicurus phoenicurus) in September
- Ageing Black-eared Wheatear (Oenanthe hispanica) in summer
- Ageing Northern Wheatear (Oenanthe oenanthe) in summer
Stonechats (Saxicola rubicola) in summer
- Ageing and sexing Western Subalpine Warbler (Sylvia inornata iberiae)
- Identification of juvenile Western Subalpine Warbler (Sylvia inornata iberiae) and Sardinian Warbler (Sylvia melanocephala)
- Sexing juvenile Bearded Tits (Panurus biarmicus)
- Jay (Garrulus glandarius): adult1adult2
Common Crossbill (Loxia curvirostra) and Two-barred Crosbill (Loxia leucoptera)
More on Common Crossbills (Loxia curvirostra) and (here)
- Ageing and sexing Reed Buntings in summer

Balearic subspecies: S.c.moltonii, M.s.balearica & L.s.badius

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