Newshub Live at 6pm hosts Sam Hayes and Mike McRoberts lose it over fake Chinese sun bear story

Newshub Live at 6pm presenters Sam Hayes and Mike McRoberts caught a strong case of the giggles live on air on Tuesday night over a story about bears at a zoo apparently actually being "humans in disguise".

Footage of a sun bear standing on its back legs at Hangzhou Zoo in China went viral, with some saying the bear's slender legs and folds of fur made it look like there was a human in a suit acting the part.

Despite starting off the story confidently, Hayes fought to keep her composure as McRoberts began to giggle off camera.

"Mike, keep it together," she said.

However, when footage of the bears standing upright showed up on screen, Hayes also succumbed to escalating laughter.

As the video showed folds of fur and amid reports people had complained "the costume didn't fit properly", McRoberts could audibly be heard laughing.

"That's not a bear," he said as the broadcast cut back to the pair in the studio.

Hangzhou Zoo has denied its bears are humans in suits amid rampant speculation.

Watch the video above.