The sun was already up, so I couldn't see whether they glowed. ADDENDUM: According to Wikipedia ( http://en.wikipedia.org/wiki/Chicken_egg_sizes ), in the USA jumbo is 2.5 oz or greater in weight, so maybe twins do get favored in that selection. Medium -- greater than 1.75 oz. Large -- greater than 2 oz. Extra Large -- greater than 2.25 oz. Jumbo -- greater than 2.5 oz.