BBC NEWS | Science/Nature | Male mouse sings a song of love

"When the males encountered cotton swabs dunked in female mouse urine, they broke into song.

Dr Holy and his team processed the sound recordings to make them audible to humans, lowering the pitch without interfering with the tempo.

Instead of making the ultrasonic chirps randomly, the mice used several different types of syllables arranged in regular, repeated time signatures resembling birdsong."