Songbirds are not born with songs in their heads, but learn them from others. And as in a game of telephone, it would seem natural that, over generations, the songs might change. The researchers conducted a statistical analysis of songs, using elements like number of notes, note duration and trill rate. As they report in Biology Letters, in each year’s recordings there is a lot of variability in the songs. But from one period to another, there are some songs that match quite closely.
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