In Australian English we have a phrase 'emu parade' which refers to the action of one or more people walking around searching for specific things on the ground in a certain area. For example, say you have a picnic in a park, afterwards you'd systematically walk over the area looking at the ground and pick up all the rubbish you might have dropped. Or if you went camping, when you packed up the tent at the end of the trip you'd walk around the area it was on looking for any tent pegs, etc that might have been left behind. Both of these things would be referred to as an emu parade.
I've been told it's called an emu parade because it mimics the way emus forage for food, but I don't know if that is correct.
My question is, what is this called outside of Australia? Mostly I'm after English phrases, but if you happen to know of an equivalent in another language I'd be curious to hear it.