Double-yolked eggs are reasonably common for ducks and chickens, despite the fact that we so rarely see them in stores. It is estimated that 1 in 1,000 eggs (out of 50 billion produced annually in the US) have double yolks. Eggs increase in size as the number of yolks increases, but most of them are caught by "candling," or holding the egg up to a light source to reveal a shadow of what is inside the shell, and used for other egg products instead of being mixed in with single-yolks. Stores that do offer the eggs usually have one local source for them. The chickens, ducks and other birds that lay them have a genetic tendency to produce the eggs, so if a farm is stocked with such birds, most of their eggs with have double yolks. The eggs are popular with anyone who likes yolks and are also believed to be good luck by many.

Far less common are multiple yolk eggs, including triples and quadruples, like the one pictured above. Apparently, the greatest number of yolks found in one egg was nine!

If you can't find any multiple-yolk eggs in your neck of the woods, you can always separate one egg, add the yolk to another, and save the white for later.

You have probably seen cartons of eggs in the store from "free range" or "cage free" hens, but what about all those other eggs on the shelves? At stores like Wild Oats and Whole Foods, only cage-less eggs are sold, but by some estimates, the eggs from caged hens in an ordinary grocery store could be more than 80% of those on the shelves. Eggs from caged hens are not labeled in any particular way, leaving consumers with the impression that the eggs have a blank slate. In other words, if it doesn't clearly state the eggs' origin, consumers aren't going to spend too much time thinking about it even if they don't support caging chickens.

At least, this is the theory put forward by Washington DC council member Jim Graham, who is proposing a law that would require supermarkets to display signs stating that "Eggs may be from caged hens" on displays of eggs not labeled otherwise. He says that this would increase consumer awareness for the issue, which is receiving more and more attention from animal rights groups, as well as individuals who are "interested in protecting animals"