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Australia's multimillion dollar broadband network is under attack - from cockatoos.

The National Broadband Network (NBN) company said it has spent tens of thousands of dollars so far fixing cables chewed by the birds.

Australian broadband is already criticised for being slow. According to a recent report it ranks 50th in the world for internet speed.

NBN estimates the bill will rise sharply as more damage is uncovered.

In an attempt to improve - a national telecommunications infrastructure project has been instigated and is due for completion in 2021.

But engineers returning to sites have found spare cables chewed and frayed. The culprits are cockatoos, a type of parrot which normally eats fruit, nuts, wood and bark.

NBN has had to replace power and fibre cables at a cost of tens of thousands of dollars each time. So far, they say, they have spent A$80,000 ($61,500, £47,000).

Eating cables "would have to be an acquired taste," animal behaviourist Gisela Kaplan told Reuters.

"It's not their usual style."

She suggested the colour or the position of the cables could have attracted the birds.

"They are constantly sharpening their beaks and as a result will attack and tear apart anything they come across.

"Unfortunately, they've developed a liking to our cables.

"These birds are unstoppable when in a swarm," co-project manager Chedryian Bresland said in on Friday.

"I guess that's Australia for you; if the spiders and snakes don't get you, the cockies will."

, that will protect the wires from birds in future and save their three billion dollar network.