Kleptoparasitic

Kleptoparasitic animals are thieves and bandits. They steal food, nest material or other resources from their own species or from another one. Gulls are a famous example - they harass other seabirds such as puffins and kittiwakes into giving up their fish, and even snatch chips from unwary people on many a seafront. Lions and hyenas both steal each other's kills, so both can be considered kleptoparasitic.