Robin red breast

I was mowing some grass today (couldn't really call it a lawn any more - 30 years of moles) and I was followed by a robin. As I progressed it would jump down and be finding things to eat. No Idea what it was finding but has anyone else had this happen? Not sure how mowing was uncovering stuff for it. He(?) has followed me lots of times when i dsturb the soil e.g. planting out beans or anything but never when mowing before.