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As per title: If fertilized, is a double-yolk egg capable of producing two viable chicks (that could survive to adulthood)?

Have there been any reported cases of such (presumably) fraternal twins?

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According to the discussion here they normally fail to hatch because the chicks cannot get enough leverage to break the shell.

Here is a video of an assisted hatching. It is claimed that these two survived.

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  • $\begingroup$ I wonder then, if someone assisted to break the shell, or the shell was particularly thin, then perhaps they could survive. I was wondering if there would be enough physical room in one shell, although I have noticed that double yolk eggs are typically noticeably larger than normal. $\endgroup$ – Bohemian May 12 '14 at 23:05

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