If you thought it was just in Hindi films that the hero sang out to the heroine when he was trying to woo her, think again.
Male mice sing to female mice when they come across atractive female mice 🙂

within seconds of encountering the scent of female mouse urine, the males broke into ultrasonic song. Dr Holy and his team processed the sound recordings on a computer and made them audible to the human ear, first by slowing down the entire audio track, and then by keeping the tempo but significantly lowering the pitch.

Tho tho thweeth – wonder if Douglas Adams was right about mice 🙂