Asnake that eats a mouse is an exampe of

A snake that eats a mouse is an example of predation.

In predation, there are usually two roles that are exhibited which are the predator and the prey. The predator is the organism that hunts and eats the prey and the prey is the organism that is being eaten by the predator as food. In this case, the predator would be the snake and the mouse would be the prey. This example is a commonly used to demonstrate such. This become even more complicated when the food chain is introduced or a sequence of predation where in a predator also becomes a prey and a prey was once a predator.