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Ammon News - The white corellas gathered in huge numbers on top of the houses and over the lawns in a clip going viral on TikTok. Terrified viewers compared the clip to a horror movie scene.

This is the eerie moment a huge flock of white parrots invaded a small town, forcing all residents to stay indoors.

The birds, identified as a form of cockatoo known as corellas, are native to the New South Wales Shoalhaven region in Australia.

Residents living in a suburb town not far from Sydney woke up to what they called a "Hitchcockian" scene where thousands of corellas descended upon their roofs and drives.

Freakish footage shared onto TikTok captures the birds shrieking wildly as they carpet streets, rooftops and lawns in the town of Nowra.

They are even seen perching on street poles and power lines. At one point, the group take off and fly past the cameraman's house at a low altitude.

The corellas, which is a type of cockatoo, can be incredibly destructive, 9News reported.

They often destroy crops and gardens in the search for food, causing heartache for farmers.

But due to the fact that they are a protected species, there is little that can be done when it comes to curbing their sometimes unruly behaviour.

Viewers said the nightmarish scene resembled the crow attack scene in Alfred Hitchcock's movie The Birds.

One confused the parrots to owls and made a reference to a famous Harry Potter scene, commenting: "I'm just waiting for a letter from Hogwarts."

Professor David Phalen, an expert in wildlife health and conservation at Sydney University, said the birds would find a place to feast before moving on to their next destination and they tend to flock in huge numbers during the non-breeding season.

He told NCA News Wire: "They’re basically nomadic. They just go looking for food, and when they find something they like, they all descend on it.

"They eat it all up and then they move to someplace else. It’s pretty normal behaviour."

The expert watched the clip and believed the birds might have been feeding on something in the yards.

"I don’t know if it’s after the rain or what, but there are grubs or something in those yards that they’re really attracted to," he commented.

*Dailystar