They say that the federal Fish Passage Center, created by the Northwest Power Planning Council to monitor fish counts and water flows on the Columbia and Snake, has documented a direct correlation between higher flows and salmon survival.

CNN: River watch: Is Columbia tapped out?

The U.S. Fish and Wildlife Service has banned the importation of Burmese pythons, along with three other exotic snake species and their eggs.

CNN: STORY HIGHLIGHTS

There is wildlife present, mostly in the form of little fish that will nibble at your feet if you are still, as well as the occasional turtle or snake.

CNN: 3 undeniable reasons to explore Mexico