Scientists have discovered that mice love to sing, and are born knowing how to do so.

The scientists discovered that when a male mouse spots a female mouse that he likes the look of, he will burst into song. The female mouse then picks the male who is the best singer.

Unfortunatly, the ultrasonic chirps and whistles are too high-pitched for humans to hear.

Back in 2005 scientists discovered these 'mouse songs', and since then have been working to discover if the mice learn these songs from their mothers, or are born knowing them.

By switching mouse babies at birth, the scientists discovered that the male mice sing the same songs are their real, not their foster families, which means that they are born knowing the songs.