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A jaguar was recently spotted in southern Arizona, suggesting suitable habitat exists along the border with Mexico. The big cats are rarely seen outside captivity, such as this one in a zoo in Amsterdam.

When Ganesh Marin was studying ecosystems along the border U.S.-Mexico this year, the University of Arizona Ph.D. student wasn’t expecting to see a young jaguar sauntering in his video feed in mid-March. Read more»

Since 1988, recovery programs for endangered Colorado River fish have cost hundreds of millions of dollars, funded by a mix of hydropower revenues and the Interior Department. Biologists say the effort is beginning to pay off. Read more»

A jaguar crossing the Santa Rita Mountains, photographed this spring.

New photographs of an endangered jaguar in the Santa Rita Mountains have been released from a project managed by federal officials and University of Arizona researchers. Read more»