The U.S. Fish and Wildlife Service has proposed listing two Western minnows in the West as “threatened” under the Endangered Species Act. The agency says human activity has caused the numbers of two chub species to dwindle. Arizona Public Radio’s Ryan Heinsius reports. 

Randall Babb / Arizona Game and Fish Department

There was a time when scientists feared the demise of an ugly little fish called humpback chub, which has lived in southwestern rivers for millions of years. One of its last holdouts is in the Grand Canyon section of the Colorado River at a major tributary, the Little Colorado. Glen Canyon Dam took its toll on the little fish, and by the late 1990s, its population plummeted to a few thousand.

But these days, the humpback chub appears to be making a comeback.