All food is energy. All carnivores that kill creatures to eat the flesh of the body are doing so for energy. That energy is consumed by the body to run the machine that is the body. This kind of predator must hunt and kill its prey. If the prey can fight back the predator can be killed by its own prey. If the predator kills its prey the energy that can be obtained from the consumption of the body of that prey is limited to that one body. So the predator must go out and kill again. A parasite does not kill its pray.  A parasite lives on or within its prey to feed off the pray until their prey dies.

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