Welcome to the Guppy Guppy Evolution website!

Download the app, watch the videos, and find out what we know about evolution thanks to guppies.

Evolution Explained

Confused about evolution? You’re not the only one! Watch this video to bone up on evolution basics.

Guppies Evolve!

It’s surprising but true that the humble guppy has taught us a lot about evolution. Watch this video to find out how.

Download the app

If you haven’t yet, download the free iPad/iPhone app to explore guppy evolution in a tropical stream.

Meet the real-life creatures

Click the image below to see more creatures

Scientist Profile

Dr. David Reznick

David is an evolutionary biologist that has spent almost 30 years studying guppies on the Caribbean island of Trinidad. During that time he invented a way to mark guppies so they could be studied in experiments in natural environments.  He then used that technique to conduct some of the first experiments to show that evolution can happen much faster than suggested by the fossil record.


Learn more about the science >


More resources on guppies and evolution

Sex and the Single Guppy

A simulation activity where users can create virtual guppy streams and then watch how their populations change over time.

Myths and Misconceptions About Evolution

This excellent TEDEd video gives a clear explanation of the basic principles of evolution and how it relates to all of us.

The Five Fingers of Evolution

Another great video from TEDEd, this piece explains a five finger trick for understanding the five processes that drive evolution.