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On the Ground

Energy and Environment in the West

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He roams alone: El Jefe may be the last wild jaguar in the U.S.

They call him El Jefe and he roams alone. Pictures have appeared for years, just glimpses of the rare beast prowling the Santa Rita Mountains outside of Tucson. Then, on Wednesday, video surfaced and there he was for all to see in muscular motion — what some scientists say is the only wild jaguar...

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