A look back at Biosphere 2, an experiment that attempted to replicate Earth's biosphere artificially by locking specimens of multiple species of animals and plants including humans inside a large chamber near Oracle, AZ in the 1990s. The experiment ultimately failed but much was learned. Bird of the week: American Redstart. Birding Hotspot: Patagonia Mountains IBA in southeastern Arizona. Friend-of-wildlife agency: Arizona Ecological Services Field Office. Calendar of bird friendly events coming up in Arizona.