The data displayed for this chart goes back to 1997, however we hope to be able to offer deeper historic information at a future point ...

Hear the different songs of three lacewing flies in this interactive activity. These songs are an example of a reproductive barrier that can lead to speciation; the differences among the songs ...

artist’s childhood, historical events) For example, songs written during the Great Depression may have a sad meaning due to the economic difficulties during that time period ...