the process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth.
Darwinism, natural selection
"his interest in evolution"
the gradual development of something, especially from a simple to a more complex form.
"the forms of written languages undergo constant evolution"
I designed EVO so it can be fished with either a Skagit or Scandi line. I use a lot of the same proven color patterns that I know work but every fly pattern has it own silhouette, movement, sinkability rate, and castability.
EVO is 2.5 - 3 inches long. A good summer and fall Steelhead fly.