There should be a color difference and definitely a size difference. If the eggs are bigger than the palm of your hand, almost bigger than your palm from the bottom to the tip of your fingers, it is a good chance that it is a swan egg. Swan eggs are huge. Swan eggs are lightly greenish in color but will turn whiter as they age. You might want to check online the difference and you will see the size and color of each. The Regal Swan
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