Food chains usually start with plants, these are producers. They provide energy for consumers.
These creatures are primary consumers, they eat plants but do not kill other animals to eat.
Predators are animals that hunt and eat other animals. They must watch out for other predators that may want to make a tasty snack of them too.
Watch out little frog!
Apex predators are animals that hunt other animals but do not have any natural predators of their own. They are at the top of the food chain.