Predators need not eat prey entirely; for example, some predators cannot digest bones.Some may eat only part of an organism, but still consistently cause its death.
Predators may hunt actively for prey in pursuit predation, or sit and wait for prey to approach within striking distance, as in ambush predators.
Some predators kill large prey and dismember or chew it prior to eating it, such as a jaguar or a human; others may eat their prey whole, as does a bottlenose dolphin swallowing a fish, or a stork swallowing a frog.
The key characteristic of predation is the predator's direct impact on the prey population.
Selective pressures (coevolution) imposed on one another often leads to an evolutionary arms race between prey and predator, resulting in various antipredator adaptations.
Like the previous two classifications parasitoid predators do not kill their hosts instantly.