A butterfly effect in the story “A Sound of Thunder” is created in one of two way this first being when Eckles gets scared of the Tyrannosaurus and decides to run back to the time machine, on his way back he steps in some mud and kills a butterfly. The second thing that could have resulted in a butterfly effect is when the tyrannosaurus was shot and killed by the other hunter’s it could have stepped on something that it wouldn’t have if it just died by the tree falling on it. This results in a butterfly effect that changes the future in many ways, the most problematic one being that Keith was not elected as president. Some things that the butterfly effect changed was the spelling of words, also colors were slightly different. There were likely many more changes in result of the butterfly effect.