The weight may be the same, but I seem to have noticed that the yolks are smaller.

dcarch

I agree with dcarch, but buying local farm eggs those seem to have larger yolks and a brighter orange color.

The trend has been for bigger yolks, so if they're getting smaller, they may be getting back to normal. There is a range for single eggs of each size by definition. I posted links to the charts awile back. On mobile now, or I'd look them up. The brighter orange yolk might be the breed, but generally it's more likely to be corn, rather than soy, fed.

I've noticed that the large eggs seem smaller. But I did get a batch that seemed a bit larger than usual.

When I was in western Canada a few years ago, all the yolks in the eggs were an anemic looking pale lemon color.

I have a hard plastic container that I use for storing eggs, and I have noticed that eggs are getting larger and that they no longer fit as neatly into the container as when I bought it a few years ago.

In California, chickens are fed marigolds to make the yolks a darker yellow, or at least they used to be.

Eggs by weight and volume: http://www.thekitchn.com/medium-large-jumbo-how-egg-sizes-actually-measure-up-ingredient-intelligence-200891

More than you want to know about egg grading and a reference to weight by the 30 dozen case lot by USDA. https://www.ams.usda.gov/sites/default/files/media/Shell_Egg_Standard%5B1%5D.pdf

Handy chart by dozen, case and egg: https://www.google.com/search?q=egg+size+chart&newwindow=1&hl=en_US&prmd=inv&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiz6-2PkvrVAhUP-2MKHV8uBe0Q_AUIECgB&biw=1024&bih=660#imgrc=SdnpKwn1YwDLBM:

I imagine chickens might like marigolds. :).

Special diet of marigold is fed to chickens to make their skin yellow.

Special diet is fed to farm raised salmon to make their meat red.

dcarch

I am quite certain that my extra large eggs are shrinking. I too have a plastic container that I keep my eggs in, and it does hold more than what it used to. Maybe yolk weighs more than white?

We have hens so we have a supply of fresh eggs every day and share the extras with friends and family. Our eggs that we would consider small to medium from our hens are extra large at the grocer. Our hens are spoiled though. No hormones or artificial stuff used and no need for marigold, a very fresh egg from a well cared for hen is almost orange not the lemony yellow of grocery store eggs. If you live close to a source for fresh eggs give them a try.