In ecosystem predation is a biological interaction where a predator (an organism that is hunting) feeds on its prey (the organism that is attacked). Predators may or may not kill their prey prior to feeding on them, but the act of predation often results in the death of its prey and the eventual absorption of the prey's tissue through consumption. Thus predation is often, though not always, carnivory. Other categories of consumption are herbivory (eating parts of plants), mycophagy (eating parts of fungi) and detritivory, the consumption of dead organic material (detritus). All these consumption categories fall under the rubric of consumer-resource systems. It can often be difficult to separate various types of  feeding behaviors. For example, some parasitic species prey on a host organism and then lay their eggs on it for their offspring to feed on it while it continues to live in or on its decaying corpse after it has died. The key characteristic of predation however is the predator's direct impact on the prey population. On the other hand, detritivores simply eat dead organic material arising from the decay of dead individuals and have no direct impact on the "donor" organism(s).

Prey is a first-person shooter video game developed by Human Head Studios, under contract for 3D Realms, and published by 2K Games, while the Xbox 360 version was ported by Venom Games. The game was initially released in North America and Europe on 11 July 2006. Prey uses a heavily modified version of id Tech 4 to use portals and variable gravity to create the environments the player explores.