Rapacity

The quality of being rapacious; rapaciousness; ravenousness; as, the rapacity of pirates; the rapacity of wolves.

The act or practice of extorting or exacting by oppressive injustice; exorbitant greediness of gain.

(of an animal, usually a bird) The quality of subsisting off live prey.; "The rapacity of carnivorous animals has been considered by some writers to have had a considerable effect on the distribution and even on the extinction of others."