* 27 hours: The alimentary tract appears
* 28 hours: The brain crease begins to form
* 29 hours: Somites appear.
* 31 hours: The brain and nervous system begin to form
* 32 hours: The head fold begins to form.
* 34 hours: Blood islands appear.
* 37 hours: The heart begins to form.
* 52 hours: The ears begin to form
* 58 hours: The heart starts to beat
* 88 hours: The bill begins to form
* 92 hours: The legs begin to form
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