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CHICAGO (AP) - An endangered monkey is in quarantine while experts at the Lincoln Park Zoo try to determine what killed three other Francois langurs, the latest in a series of animal deaths that have prompted activists to call for a criminal investigation.
The U.S. Department of Agriculture is already looking into possible violations of the Animal Welfare Act at the zoo, and the group that accredits U.S. zoos is now reviewing all animal care practices there.
Zoo officials say the unexpected deaths of the monkeys this week may be linked to their recent move to a new exhibit that gave them access to the outdoors.
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