In February, the Arizona Game and Fish Department announced excitedly that it had collared the first jaguar in U.S. history, in the desert southwest of Tucson. Some environmentalists, however, received this news with dismay. State officials found the exceedingly rare, 118-pound cat because it wandered into snares set for cougars and bears as part of a separate state project. And within weeks, the state announced it had to euthanize the animal because it was injured -- possibly by the same snare that initially captured him.
http://latimesblogs.latimes.com/greenspace/2009/12/arizona-jaguar-endangered.html