By Julian Robinson for MailOnline
Published: 17:20 GMT, 6 March 2019 | Updated: 23:47 GMT, 6 March 2019
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A chimpanzee started gnawing at his own arm after consuming liquid containing drugs from a bottle that was tossed into his enclosure in Norway.
Keepers became concerned when they noticed Julius, a 39-year-old chimp, acting strangely at the Dyreparken Zoo and Amusement Park near the southern city of Kristiansand.
A family visiting the zoo told staff they had seen someone throw a bottle into the enclosure.
Keepers say it contained narcotics which had put Julius - the zoo's only chimp able to unscrew bottle tops - into a psychosis-like condition.
Chimpanzee Julius (pictured) started gnawing at his own arm after consuming the contents of a