What is main food source?

Please provide more context! "Main food source" could refer to many things. For example, are you asking about:

* The main food source for a specific animal or group of animals? (e.g., "What is the main food source for a giraffe?")

* The main food source for a particular population of people? (e.g., "What is the main food source for the people of the Amazon rainforest?")

* The main food source for the entire planet? (e.g., "What are the main food sources for humans globally?")

Once you give me more information, I can help you find the answer. 😊