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As with any bird's egg you can use a technique called "candling". All you need to do is hold the egg over a bright light such as a flashlight. If the egg is more than three days old and is is fertilised you will see a dark spot inside and a criscrossed lattice of blood vessels just inside the shell. When the fertilised egg is about eight days old you may even be able to see the embryonic chick wriggling and kicking inside and if you are very lucky the heart may be seen beating. This technique does not harm the egg in any way.

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16y ago

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