ORACLE, AZ — Four dozen Sonoyta pupfish are now swimming beneath the towering glass pyramids of the University of Arizona’s Biosphere 2 after a multi-year effort to conserve the critically endangered ...

The rare Sonoyta pupfish were introduced into a desert river habitat inside the huge Biosphere 2 structure near Tucson. The dish are native to Quitobaquito Springs near the Arizona-Mexico border, but ...

Biosphere 2 started with eight scientists and a very ambitious experiment. Now, almost 35 years later, it's still being used for cutting-edge research. Scientists continue to use it to study Earth's ...