What animals con be the third level consumer?

Producers, (plants) occupy the first trophic level.

Herbivores occupy the 2nd trophic level and are considered primary consumers.

Carnivores that eat herbivores occupy the 3rd trophic level and are considered secondary consumers.

Carnivores that eat other carnivores occupy the 4th trophic level and are considered tertiary consumers.

snakes- eat other snakes, alligators- eat snakes and other small carnivores, bears- eat fish that eat other fish.