Answer: scavenging

AnswerCrossword Clue
scavenging(of an animal) Search for (carrion) as food
scavengingSearch for and collect (anything usable) from discarded waste
scavengingSCAVENGE, to search through rubbish for items
scavengingSearch for discarded items or food in (a place)
scavengingRemove (combustion products) from the cylinder of an internal combustion engine on the return stroke of the piston
scavengingCombine with and remove (molecules, radicals, etc.) from a particular medium