The transformation of bird plumage

[Dinusaur]

A Golden-crowned Sparrow appeared in allotment garden in Rosetta McClain Gardens in November and stayed through the winter until it left sometime around second half of April this year. This gave an opportunity to study how the bird plumage changed over the months from basic to breeding. Here's a composite of two photos, the one on the left was taken on Nov 21 2021, whereas the second on the right was taken on April 17, 2022. The faint yellow on its crown transformed into bright yellow with black marking around the eyebrow, giving it a full adult breeding plumage.
 

[Ally]

Awwww, so nice and educational.

[Shortsighted]

 Rather interesting comparison and one that metaphorically reminds me of my own transformation from barely a light spot on my crown to a much more profound skin-bright clearing, like those seen on satellite photos of the Amazon rain forest after sections of clear-cut are revealed. I’m certain that Neosat has my hair loss on file from all those fly-over surveillance photos and that my gradual coronal brightening has been analyzed by AI. I now mostly wear a hat, but when I don’t don a chapeau I use a black Sharpie to scribe WALDO on my crown just to keep AI interested. Perhaps next time you could offer us a time-lapse version of plumage development.