The organism that lives by preying on others is called a predator.

Here's a breakdown:

* Predator: An animal that hunts and kills other animals for food. They have adaptations that help them catch and subdue their prey, such as sharp teeth, claws, speed, and camouflage.

* Prey: The animal that is hunted and killed by a predator.

Examples of predator-prey relationships:

* Lion (predator) and Zebra (prey)

* Hawk (predator) and Mouse (prey)

* Spider (predator) and Fly (prey)

Let me know if you have any other questions!