There was a chicken who lived on a farm, and she laid eggs week after week.
Some of the eggs the farmer took away, and some of the eggs the farmer allowed to hatch into chicks.
"Look at me!" said the chicken proudly one day after laying an egg. "I've laid yet another egg! I'm a very productive chicken!"
A crow happened to be flying by and he laughed at the proud chicken.
"Stop boasting about being so productive!" said the crow. "Your fertility doesn't do you any good: you're not laying those eggs for yourself, but for the farmer."
Inspired by: Mille Fabulae et Una, a collection of Latin fables that I've edited, free to read online. I am not translating the Latin here; instead, I am just telling a 100-word version of the fable.
Notes: This is fable 515 in the book, which is Perry 202. The Latin fable is about a "columba domestica," a tame dove, but I changed that to be about a chicken since that is a more familiar farm animal.