* Rabbits: Rabbits are a tasty meal for foxes, coyotes, hawks, owls, snakes, and even some larger fish.
* Deer: Deer are prey for wolves, bears, cougars, bobcats, and even large birds of prey.
* Mice: Mice are eaten by cats, owls, hawks, snakes, foxes, and many other predators.
* Insects: Insects are a vital food source for birds, bats, frogs, spiders, lizards, and many other animals.
The answer depends on the ecosystem you're thinking about! What kind of environment were you thinking of?