A long time ago in South East Asia there was a fowl that lived in the jungle. Every few years there would be a big rainfall and the jungle would get very lush and food was plentiful. These birds evolved to lay lots of eggs during this time so they would multiply a lot. After the food was gone, the population would decline again. The humans in the area realized that they could make the birds lay a lot of eggs simply by feeding them a lot of food. This happened thousands of years ago and those jungle fowl were domesticated into modern chickens.
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