Court complaint threatens to separate Molly the magpie and Peggy the staffy - again

They're the best mates who captured hearts around the world when they were torn apart from each other in March.

But just as they're finally reunited and happy, there's another complaint threatening to separate Molly the magpie and Peggy the staffy.

Earlier this year, the bird fight became a political fight and global clickbait with Queensland's Premier Steven Miles even forced to weigh in.

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Eventually, authorities granted a licensce with special conditions so Molly could return home to owners Juliette Wells and Reece Mortensen.

But A Current Affair can reveal their licence to keep Molly is now being called into question.

Legal documents have revealed an anonymous wildlife support volunteer and magpie specialist is challenging the Queensland government's decision to reunite the magpie with the family.

"Molly's 100 per cent, and always has been, our focus, his well being... and we just want to just move on and just get over, get on with it," Mortensen said.

One of the strangest aspects of this new legal twist is that Mortensen and Wells don't even know who's behind it.

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The applicant is unnamed in court documents and will stay anonymous as they contest the government's decision to grant them a special licence to care for Molly.

"Four years ago yesterday, when we came across a little magpie, who would have thought we'd be standing in front of the Supreme Court here in Brisbane," Wells said.

"Every time we're in the public sight and things like that, it raises awareness for people to get out there and try and do something to help wildlife and become involved," Mortensen added.

"That's what we want to try and do is get get as many people involved as we possibly can in helping wildlife."

Watch the full video in the player above.