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A 59-year-old Austrian zookeeper has been sacked after planting and cultivating up to 30 marijuana plants in a rhinoceros' cage over an eight year period.
The elaborate operation was discovered at the Hellbrunn Zoo near Salzburg after a tip-off from one of the keepers' drug clients.
The man was the only human allowed in the enclosure, which allowed him to tend to his plants without suspicion.
The rhinos never ate the cannabis plants.