Ready Made Tracks

I was the first up the track to our dig site this morning. It is very dusty with the consistency of talcum powder. I noticed bird foot prints and a lizard trail. Then I came across a couple of tracks like this and couldn't work it out. When I came across the third and biggest, the one in the photo, I realised what they were. Viper tracks, about 20m from where we spent the morning digging.