Magpies

     I saw two magpies this morning at about 6:20 am in the suburb of 
     Hawker in Canberra, on the grassy verge on the side of the road.  They 
     were on the ground, sometimes warbling away together, sometimes 
     appearing to groom the other, and then wrestling around, lying on the 
     ground.  They did this a couple of times, then got up and seemed to go 
     about their business, still sort of in company.  They appeared to be 
     females, or perhaps immatures (at least not shiny white; beaks not 
     very white if that means anything).  
     
     I haven't seen this behaviour before.  Can anyone give me a clue what 
     they were up to??
     
     Cheers
/////////////////////////////////////////////////////////////////