In reply to GrahamUney:
> Yes, they do go back, so don't worry. The 'wounded bird' thing always seems a bit of pointless exercise to me. If they didn't bother most walkers/climbers wouldn't even see them. It just draws attention to the fact that they've got chicks nearby. Quite a few other birds do the same thing - a lot of waders (Dunlin, Golden Plover, Ringed lover all spring to mind).
Perhaps they evolved before us and don't want to change their act?