A BIT of monkey business by Hamish and Andy at Werribee Zoo left one family feeling cheated. They thought they were watching the real thing.

The hit comedy duo donned gorilla suits for a TV sketch in which they played with a remote-controlled car and a golf club, the Herald Sun reported.

Michal Pecek, who visited the zoo on Saturday with his children and friends, thought he was watching an authentic pair of jungle primates.

It was only after arriving home that Mr Pecek zoomed in on his photos and discovered they were phonies.

Inquiries from the Herald Sun unmasked the pair in gorilla suits as the much-loved Hamish and Andy.

The cheeky stunt, filmed for an upcoming television special on Channel 10, left Mr Pecek unimpressed.

"I go there to see animals, not actors," he said.

"Most people who were there on Saturday believe they are amazing, smart gorillas."

The Southbank father can't bring himself to tell children Oliver and Michaela the gorillas weren't real.

He said he felt "deceived".

"I was taking pictures of the gorillas and said: 'It's amazing they are playing with the remote-controlled car'.

Werribee Zoo spokeswoman Kym Carter said filming of the stunt was closely supervised and visitor feedback had been positive.

Ms Carter said the segment had been supervised closely by many people, including Bondi Vet's Dr Chris Brown, several zoo staff, television producers and camera crew who informed visitors about the filming area.

"There were also several large signs asking people to avoid the filming area if they did not wish to be filmed."

A Channel 10 spokeswoman said Hamish and Andy's special would air later this month.

Read more about Hamish and Andy at the Herald Sun.