If you eat plenty of eggs, you might encounter a rare double-yolk, which appears in about 1 out of every 1,000 eggs laid by hens who are either beginning or ending the egg-laying phase of their lives. It’s even possible to find triple or quadruple-yolk eggs, but the world record for the most yolks found in a single egg is even more surprising.

In July of 1971, Diane Hainsworth of Hainsworth Poultry Farms in Mount Morris, New York found an egg with nine yolks, setting a Guinness World Record that has stood for almost fifty years. Any egg containing more than one yolk, from two to nine or more, is perfectly safe to eat, so if you ever find one, consider it a bonus.

One thing to keep in mind is that if you're cooking with eggs, an egg with more than one yolk will require you to modify your recipe. Using a double-yolk egg in a recipe that calls for an exact number of egg yolks can throw off the ratio of protein to fat and sugar, so be sure to adjust accordingly and balance it out with single-yolked eggs.