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@Luther: Come on. Maybe one or two, but ALL TWELVE? This is pretty crazy.

Isn't this a sign of the apocalypse?

I dunno ... either this is really, really cool ... or the yolk's on SE ... ;-)

wow, how do they select for double-yolk ones?

They come from first year laying hens. These girls are novices. Next year they will lay one yolk eggs. Talk to your local farmer and he should confirm this.

Had to confirm my info and the first year laying hens are called pullets, like cows are called heifers when they calf for the first time.

Don't be afraid to eat these eggs. It is common. Nothing freaky, nothing poisonous. It is what it is. I think of it as a sign of good luck.

Did you buy them on April Fools?? ;)

This happened to me once with a box of eggs from Earthbound, an organic food shop in Bristol (UK). As a few people have said, young hens lay double-yolked eggs.

I remember seeing a show on egg producers and they check for the double yolk and remove them. I have eaten, cooked, openned 25 dozen each weekend day for a restaurant and have never seen a double yolk

I think people arent qiuite getting things to add up. Here's the thing:
Hens lay on average, one egg every day.
When they are new to egg-laying, they do so less frequently, probably because their bodies arent quite in sync yet.
The egg production doesnt always happen at the same rate as shell production.
That means, if they arent laying (i.e. making shell) as fast as the egg part is being produced, their eggs are going to be double-yolk. This means they will lay bigger eggs.
Since eggs are sorted by weight, Jumbo eggs tend to have double-yolks more often.
If you don't buy/use Jumbo eggs, you probably wont see them. If an egg production place chooses to sort and pull all the double-yolked eggs and use them for other stuff, then... you'd never see them.
You should never find an chick in an egg (unless its purposeful like in balut) because the hens are kept separate from the roosters..
:]
My mom always told us that finding a double yolk was good luck.

are these chickens on fertility drugs?????

I had a double yolk today. Same deal - was making deviled eggs. Awesome.

Does anyone understand that double yolks in eggs in the spring is a natural occurance? I am still reading comments that lend the idea that this is a freak of nature. We had eggs delivered each week for years from the local farmer. Pullets-first year layers is the answer. Not God, not Trader Joe's no matter how great their bean dips are.

same exact thing happened to me a couple of months ago, bought from the brooklyn trader joe's...

A restaurant that was close to where I lived when I was a kid always had double-yolked eggs. So, if you got 2 eggs over easy, it looked like you were getting 4 eggs instead of two because of the yolks. I always thought it was kind of a cool thing.

I'd suppose that the double-yolked ones might be separated out if there were customers who specifically wanted them.

I wonder if the yolk-to-white ratio is different.

Adam-Still not that extraordinary. They came from the same supplier. There are huge production farms in lower De. for the purpose of supplying this type of product which is considered premium now. It used to just be a normal course of production of the farms out my way. Still is when I visit my local Amish farmer for my fresh eggs.

Eww. That's just too many yolks in one carton. One or two double yolks? A pleasant surprise. But all twelve? That's just too much of a good thing.

I buy my eggs at Trader Joe's (in Philadelphia) and have a double yolk in just about every dozen. Sometimes two or three. I always thought it was a sign of good luck, but the whole dozen! I dunno about that.

This is so weird...I bought a dozen eggs at Fairway the other day from the same farm and they all came out with two yolks. There was no discernible difference in taste or texture.

at this co-op that i shop at they sell fertilized and unfertilized eggs and the fertilized ones have double yolks, but the unfertilized ones don't....maybe you are eating fertilized eggs?

Chernobyl Egg Company...

At the farmers market I go to in Dallas one of the farmers seperates out the double yolked eggs and you can buy those by the dozen.

Kinda reminds me - new meaning for the term Octo-mom!

thanks to janaatwg for the enlightening info! I believe in scientific facts too :) well, janaatg, can you help me answer this question: my mom cracked an egg with the egg white part a neonish yellow!!!??? we didn't eat it because it looked kinda toxic...

Whenever I buy jumbo eggs at a local ShopRite, ALL of them always have double yolks, with a very rare exception. I'm not talking about one dozen here - every dozen I buy from there, and it's been this way for at least a couple of years. I don't understand what exactly is sick or creepy about it.

This just FREAKS ME OUT!

Total jackpot! Thanks for all the info, guys. My SO LOVES yolks and so do I. I usually don't get jumbo or buy eggs at TJ's but you better believe I am going to do so from now. I have stumbled upon a few double yolks before and was always totally stoked. I would consider myself very lucky to find a whole carton of doubles. Nothing freaky here, just delicious!

It's a government plot to get everyone to switch to artificial eggs produced in a secret laboratory underground in area 52 next to area 51, using toxic waste. It's all so simple.

I need to share my own double-yolk experience. I live in Paris. I often buy cartons of 30 eggs from our cheese/dairy vendor at the outdoor market. Two weeks ago, every single egg out of 30 had a double yolk. I couldn't believe it! The next time I talked to the vendor, I explained what happened & he said it was normal & that you'll find "twins" in the larger, longer eggs.

So, thanks to the previous comments for reassuring everyone that this is actually nature! And explaining why. Between you & my vendor, I feel no more fear with multiple double-eggs in the same carton! Not a freak thing after all.

Same thing just happened to me! I bought the eggs last night from TJs, but they're only large, not jumbo. Weird!

when i was a kid we had a chook (that's what we call chickens in AUS) that laid double-yolkers every time

When I was young and impoverished I used to work in an egg packing factory, a horrible job, but it paid well. As people like their eggs uniform my job was to check that the eggs were all the same - they would pass in front of me on a metal grid and a bright light was shone through the eggshells.
Any non-uniform eggs - double yolkers, part fertilised, deformed shells, that sort of thing, were snatched from the line and thrown into a big vat, and taken off to be dried to make egg powder and used in cake manufacturing

Could the egg checker in this case have meant to put the double yolkers on one side for disposal, but made a mistake and packed them instead?

We bought a flat (20) last week from a local organic market and had the same thing happen. All 20 eggs were double yolked. It was the weirdest thing.