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'In Australia, it's certainly the largest animal that's ever walked the outback,' Queensland Museum vertebrate palaeontologist, Dr Scott Hocknull, told the ABC.
'This is huge, this is a fantastic beast. Imagine something the size of a basketball court walking around on land.'
The discovery had birthed a new tourist industry in the town, where Ms Mackenzie had founded the Eromanga Natural History Museum to display parts of Cooper and other dinosaur finds in the area.
She is currently trying to expand the museum to cope with the crowds expected to visit to see Cooper.
Cooper was a vegetarian who stood 6.5metres high and was 30metres long