And more broadly, are there some good cases of bioacoustic signals being lost where the reason for the loss is well-studied?
And on other (foreign) vocalizations even more active response than on the vocalizations of the own species (maybe this is protection of their territory) .
Was it a loss of a trait or a failure to evolve that trait? For example, in long-tailed manakins its thought that dueting is an example of an extremely derived trait due to intense female selection. The trait did not evolve in non-dueting manakin species because of differing selective forces. I am not aware of an example where dueting was thought to have been lost. I'd love to hear of one if someone knows of an example.
Well, one example from primates is that duetting is almost surely primitive for the family Hylobatidae, but there are two species, H. klossi and H. moloch, that do not duet. Male and female both still sing, but at different times.
I am guessing that in the bird literature, where many taxa duet, there might be more examples of duets having been lost.
The crane (screaming birds) developed duets between female and male. In passerine birds developed song duets between males.
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