The key characteristic of predation is the predator's direct impact on the prey population.
Selective pressures imposed on one another often leads to an evolutionary arms race between prey and predator, resulting in various antipredator adaptations.
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For example, deer are culled by forestry, farming and conservation organisations for different reasons when their numbers reach levels that impact on other objectives.
This happens despite the existence of tree guards, deer fences and other deterrents and avoidance tactics.
Thus predation is often, though not always, carnivory.
Other categories of consumption are herbivory (eating parts of plants), fungivory (eating parts of fungi), and detritivory (the consumption of dead organic material). For example, some parasites prey on their host and then lay their eggs on it, for their offspring to feed on it while it continues to live, or on its decaying corpse after it has died.