Five wolves managed to escape from Colchester Zoo after the perimeter fence was damaged.
Two of the wolves were shot and killed, one was recaptured while the other returned voluntarily.
Essex Police are searching for the remaining wolf who is thought to be sheltering in thick undergrowth.
A police helicopter has been deployed to assist with the search.
For more on this story visit ITV Anglia
More top news
Months of messages contradict the public claims of doctors during the dispute and reveal pay was central to their row with the Government.
Joanna Dennehy killed three men, and stabbed two more. She was claiming damages after being placed in solitary confinement in jail.
A man in Thailand was bitten on the penis by a python while he was sitting on the toilet.