Thanks for posting those photos and info Mike. Always learn something from your posts.
I’m always amazed at how far birds migrate.
Ya well, that male redstart in the photo might be hard up.
Females prefer the ones with the reddest wing and tail patches, a measure of "fitness". How red their wing and tail patches are depends on how well they ate after breeding the previous summer when they were moulting and replacing those feathers. Those observant redstart fathers that bred late after maybe losing a first nest, or maybe even bred twice, end up feeding fledged young when they should be concentrating on eating well enough to get all redded up for the following round next year.
But no worries, only about half of 'em are gonna survive the trip back to the Tropics and back anyway. Tough world out there.
