https://blogs.scientificamerican.com/hot-planet/the-three-little-pigs-and-climate-change/

Once upon a time there was an old mother pig with three little pigs and not enough food to feed them. When they were old enough, she sent them out into the world to seek their fortunes. Before she said goodbye, she warned them to beware of the Big Bad Wolf.

The first little pig decided to settle down and build a house of straw. The other little pigs looked worried and reminded him of the Big Bad Wolf.