Experts from Colchester Zoo and police firearms officers helped in the search.
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Police said all the animals at Colchester Zoo had been accounted for.
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At Colchester Zoo, staff stroked Otto the rhino's ear, simultaneously calming the patient, bringing up a vein and slipping in a small syringe.
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Essex Police have not released any details of the cost of the search, but have said about 25 officers were called to where the animal was seen, including specialist firearms officers and experts from Colchester Zoo.
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