Roberto ‘Cigno’ Secchi says that “Another very evident variation is that the same plant can sound very different at different times of the day.

Some plants seem to be more active in the evening, others in the morning, and every plant emits a different and distinctive sequence of notes that does not seem to be linked to its size or type.

Often we find that little plants in pots will sing uninterruptedly all day long with clearly noticeable differences in style depending on the time of day.

(from “Music of the Plants” book)