Squeaks and Jessi have a story to tell you about the peppered moth, a special insect that taught us a lot about a process called natural selection.

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SOURCES:

https://animals.howstuffworks.com/ani...
https://askabiologist.asu.edu/peppere...
http://www.bbc.co.uk/schools/gcsebite...
https://www.britannica.com/animal/pep...
https://www.britannica.com/event/Indu...
https://www.britannica.com/science/li...
https://www.britannica.com/science/na...
http://www.britishmuseum.org/research...
http://eol.org/pages/298821/details