To summarize, the particular song a male sings, and the behavioral responses of females to song and morphological signals, are not genetically inherited in a fixed manner but are determined by learning early in life.

Thus mating of females was strictly along the lines of paternal song.

The divergence of songs in the new population away from those in the progenitor population would only be prevented if these processes were balanced by repeated immigration and subsequent breeding: song flow.

Apparently, some of the females that know her determined rather quickly that she was not pregnant.

Taking these [macroeconomic] changes into account is important because it represents a more comprehensive set of behavioral responses and, importantly, it emphasizes the economic benefits of good tax policy and the consequences that tax policy can have over the long run.

To me it confirms what a strong state the channel I've inherited is in.