The security measure comes a day after poachers killed a four-year-old rhino and removed the animal's horn at Thoiry Zoo, west of the French capital, Paris.
The illegal hunters broke into Thoiry zoo, west of Paris, killed the rare white rhino before sawing off its horn. A kilogramme of rhino horn fetched 51,000 euros ($53,900) on the black market in 2015.
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