A couple of my tup lambs have been going 'head to head' with my gimmers (mostly with the best one - sods law!!) Is this normal behaviour? I thought it would be normal for them to have boys rough n tumble games and 'practice fighting' with each other but didn't expect any aggro with the females! They are approaching 4 months old and due to be 'sent off' at weaning right at the end of May. Could a factor be the lack of grass to keep them occupied? They are getting 'cake' but there isn't much grass.