Would anyone have any idea what bird these eggs would belong to , we found them deep in the bush in a small opening at back creek , there was four of them and they would be at least twice the size of a duck egg , cheers Dale
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Probably a 15 foot tiger snake 
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could it be a swan egg
Maybe its a swan egg but it is right in the thick of the bush , with no water around so unlikely i think
Crows might have taken them and ate them there in the bush 
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Yes that may be the answer
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Swan is a good call, otherwise if not too far from houses, could be turkey eggs? They commonly go feral and like a bit of bush to roost in
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