A dozen eggs, with 14 yolks

(post, Kim Carlson)
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I was so taken with the bright-colored eggs at Sweet Briar Farms' booth this weekend that I bought a dozen of the XL version, just so I'd have more egg to enjoy.

Little did I know! Twice yesterday, once while baking muffins, and later while making crab cakes, I cracked open an egg only to find it contained two yolks — and plenty of whites. I didn't think to look at the shells' color, so I don't know if it's possible they came from the same hen. 

Tell me, egg ladies (and gents): Are two-yolked eggs common among happy hens — or did I find the proverbial four-leaf clover? (Twice.)

I still have five eggs left; I wonder how many yolks are left to crack? (Sorry …)