576K shows an average amount of replaced wing-coverts and tertials in the post-juvenile moult. All scapulars have been replaced for second generation feathers, including the rear lower scapulars, the ones covering the scapular coverts. In the upper scapulars, a subsequent moult to third generation feathers has started (25-50% replaced), with the third generation feathers still very second generation-like in their pattern, but grey-based and again with broad neat fringes indicating freshness.

The partial autumn moult in tertials and wing-coverts in the left wing:
tertials #1-4; greater coverts #1-6,14; median coverts #1-5, #7-10; lower lesser covert #1-8 and about half of the visible lesser coverts (50% in left wing; with 50% of the lessers visible). Outer lesser coverts and the upper row may still be juvenile.

The bill is most dark, with a slightly paler tip.