Egg Song question(s)

[LeastinID]

Sometimes we hear the Egg Song, only to find no eggs.
Sometimes we DON'T hear the song and DO find eggs.
Sometimes the song is from the coop. Sometimes some other hens join in.
Sometimes the hens and our roo join in.
Today, I was filling their feed and was able to hear one hen going off - and she was outside!
AND there was no egg.

What in the Wide World of Sports is a'goin' on here?

 

[DobieLover]

Well... first of all, there is no "egg song". It's an escort call. @Shadrach explains it well in this article.
It can also sound similar to an alarm call but the volume and urgency are different.