[GeronL]

How did the first swimming dino “evolve” paddle like feet?

[Red Badger]

Millions drowned before the natural evolution took over...............

[gleeaikin]

One day a genetic mutation occurred which cause a degree of webbing. This creature swam faster and had more offspring, then maybe another mutation, etc. Here is another link:

http://www.aol.com/article/2014/09/11/alien-like-giant-water-living-dinosaur-unveiled/20961187/?ncid=webmail12