[DallasBiff]

More than half are invasive species....

I know get mad at me, but what does invasive species actually mean?

[gundog]

Well, many arrived by means that would not be considered “ natural.” Importation for the pet industry. Many species native to Eastern North America made it over the Rocky Mountains, because of people. Their effect on existing populations are not good, generally.

American Bullfrogs, Largemouth and Smallmouth Bass, any number of species of sunfish,,,bluegill, warmouth, red-ears...were spread as the eailroads pushed west. Shad and Striped Bass were introduced into the SF area, and moved up and down the coast.