The national park behind my house is home to many eastern-grey kangaroos, red-necked wallabies and swamp wallabies. I run here quite a lot and am familiar with some of the family groups and their particular hang outs. Chopper - the patriarch of a tight family group and a common sight in my front garden - has not been seen for 2 weeks. I'm worried that he has passed away and so have been searching for him on my runs. No luck yet.