Turdus pilaris - sexing

Fieldfare / Björktrast

SEXING:

After completion of post-juvenile moult, many birds may be sexed based on the pattern of the crown feathers. However, some birds are rather intermediate and, as described in Svensson (1992), the colour of RR and feather of the back may give further help.
Male, 1cy, November. Obvious male pattern with large black centre to crown feathers. [4632761]
Male, 2cy+, November. Individual variation makes some birds less easy to sex. Here, the dark feather centre are smaller, but still show a close to convex shape and a black colour. [4632756]
Female, 2cy+, November. Obvious female pattern with a rather narrow and concave shape and grey colour to the feather centre. [4632758]
Female, 1cy, November. Some females show a larger dark centre, but note the dark grey colour and tendency to concave shape. [4632760]
Male, 1cy, November. Males generally show a slightly darker blackish tail. [4632761]
Female, 1cy, November. Female tails are generally slightly paler, often with a (weak) brownish hue visible. [4632760]
More Turdus pilaris:
Ageing autumn

Ageing spring
Moult
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