“The Bearded vulture is a scavenger, but it is the only scavenger that prefers bone marrow to meat.”
“Searching for insights, the historian becomes almost a scavenger rummaging through heaps of theories produced and then discarded by other disciplines.”
scavage
(historical) A toll or duty anciently exacted from merchant strangers by mayors, sheriffs, etc. for goods offered for sale within their precincts.