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Small waterfalls and cascades isolate the waters of the plateau, keeping downstream fish from invading the topminnow’s territory.

But they've now reintroduced the Gila topminnow and are watching greenery come back, as well as myriad species of dragonflies.

Habitat destruction and invasive species have severely reduced the range of the barrens topminnow.

The Center for Biological Diversity says the nearly extinct Barrens topminnow was proposed for endangered species protection four decades ago.

The Fish and Wildlife Service also said it would consider changing the Gila topminnow’s status from endangered to threatened.