A rare jaguar captured and collared in Arizona two weeks ago was euthanized after falling ill, state game officials said.

The jaguar was the only one spotted in the United States in more than a decade. Officials captured the cat Feb. 18 as part of a program to study bears and mountain lions. A procedure had previously been put in place to attach a satellite collar to any such fortuitously captured jaguar, so wildlife experts could monitor its movements to learn more about the extremely rare creatures.

The jaguar stopped moving, however.

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