Here's a breakdown of trophic levels:

* Producers: Plants and algae that create their own food through photosynthesis (1st level)

* Primary Consumers: Herbivores that eat producers (2nd level)

* Secondary Consumers: Carnivores that eat primary consumers (3rd level)

* Tertiary Consumers: Carnivores that eat secondary consumers (4th level)

Examples of organisms at the 4th trophic level:

* Hawks: Eat snakes that eat rodents that eat plants.

* Tuna: Eat smaller fish that eat plankton.

* Wolves: Eat deer that eat grass.

It's important to remember that there can be exceptions and variations in food webs. Some ecosystems might have simpler food chains with fewer trophic levels, and certain species might occupy multiple trophic levels depending on their diet.