--- Via Mark Crawford, 7 Aug 2025: when juvenile birds start singing again in the fall. Mating is tied to day length, and so it feels like spring. The adults are wise to this, and don't sing.
From Christine Elder
"The theory about autumnal recrudescence is this: Some sex hormones are triggered to be released based on the hours of daylight, and certain hormones “inspire” a bird to sing. At some point, when the daylight hours of autumn match those of just the right time in spring, those hormones are re-triggered and drive some birds to sing for a short period in the fall."
Perhaps also applicable to old farts who buy a fast red car and go courting young women.
Mark also shared another lovely phrase on this call: life is a “sexually transmitted terminal disease”
