The butterflies found a new meadow that was filled with yellow flowers. Sadly, the blue butterflies were able to smell the yellow flowers and the yellow ones were able to partially. The red butterflies weren't able to smell the yellow flowers at all!
The population of the red butterflies began decreasing as they were not able sense the flowers. There was fewer yellow butterflies, and the blue butterflies became the most common color.
The butterflies were able to grow and keep living on the yellow-flowered meadow. This time with more blue butterflies than any other color.