The ancestors of chickens came from southeast Asia where bamboo is plentiful. Bamboo coasts along for several decades or even over a century minding its own business, Then all of it in an area blooms. This can happen in a single year or over multiple years.
When the bamboo is blooming, the seeds are incredibly abundant. The proto-chickens were adapted to take advantage of this large food supply by pumping out lots of eggs when there is a lot to eat.
Domestic chickens carry this further.
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