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A food chain always starts with a producer. A producer is an organism that makes its own food. Most food chains start with a green plant, because plants make their own food by... In a field with many green plants, a food chain begins. First, insects eat the plants. Then, rats eat the insects. After that, snakes eat the rats, and birds eat the snakes. When the birds die, decomposers break them down. This shows how each living thing relies on another for food. Last updated at December 16, 2024 by Teachoo. Food chain tells us how energy is transferred from one organism to another. It is a linear sequence of organisms (i.e. Energy flows in one direction ) For example - Food web shows how many food chains are connected to each other. Food chain explained for kids with parts, types, examples, and a simple diagram . Learn how energy flows through its different levels.