Hedgehog fighting

An article on frivolous 111 calls lists the following calls made:

  • help needed for sewing so garden party can be made on time
  • complaint about quality of takeaway meal
  • oil stain on wedding dress
  • two hedgehogs fighting on a lawn
  • boyfriend not asking for hand in marriage
  • man scared by cow at letterbox

This got me thinking. How exactly do two hedgehogs fight? Answers anyone?