Kleptoparasite.
That's a word you don't hear everyday. It is used to describe a creature that steals food from another. It appropriately describes the behavior of the Fork-tailed drongo (Dicrurus adsimilis), an African bird that mimics the calls of predators. This false alarm is startling and makes it possible for the drongo to steal dropped food.
We used to do the same sort of thing in Junior High.
(See a sneaky drongo for yourself next year on an African safari!)