prowling

To rove over, through, or about in a stealthy manner; especially, to search in, as for prey or booty.

“It's tough to sneak vandalism into Wikipedia as there are plenty of other users prowling the Recent Changes page.”

To idle; to go about aimlessly.

“That dandy has nothing better to do than prowl around town all day in his pinstripe suit.”

To collect by plunder.

“to prowl money”

The act of one who prowls.

“nightly prowlings”