What's up with this egg?

[ccat1]

I have 4 Copper Marans (one actually blue maran) and this morning I found this egg.
I am 100% sure it is from Nugget. She was sickly for a few weeks early in her life, but was nursed to good health.
Her legs weren't fully developed so she squats a lot when pecking, but never misses a beat. Her neck isn't as long as the others.
All of this makes her our "favorite"........but she seems happy and healthy.
My Marans are now a little over a year old.
They all lay pretty much each day.
Nugget lays the darkest chocolate egg of them all.
This morning I found a small egg.
I had been gone for the past 5 days and my wife said she was acting funny off and on.
Is there something I should be concerned with at the size of this egg?
We will obviously not eat it. The lighter egg is from our blue maran, which lays a large/XL sized egg.
What causes this? I will watch her tomorrow and see if the size comes back to normal.
Thanks for any help and advice.
ccat1

 

[oldhenlikesdogs]

It probably doesn't have a yolk, some lay them occasionally, there's nothing to worry about. It's nice and dark though.

 

[szczur]

It's a fairy, rooster, or fart egg, which is a common hiccup in new layers. Generally they don't indicate anything is wrong! I looked up a ton of egg problems because mine have calcium dusted all over them