A hen called Aussie, from Bonaparte, Iowa, has laid an egg the size of a soda can which her owner hopes could make him a record-breaker.
Nathan Batten has proudly dubbed the 4.1oz beauty 'egg-normous' - and carried it around in his pocket for two days afterwards to show his friends.
But even the egg's extraordinary size - twice the size of a normal one - may not be enough to win Aussie and Mr Batten a place in the record books.
The light-brown egg is 3.5 inches long and has a circumference of 6.5 inches. Aussie laid it on February 18 and it is now sitting safely in Mr Batten's refrigerator.
Mr Batten, 37, told the Des Moines Register: 'It probably has about two miles on it from me walking. I'm lucky that dang thing never broke.'
Aussie is an Australorp hen, a breed known for its laying prowess. They produce around 250 eggs each year.
There's no doubt the egg is a whopper - large eggs in supermarkets weigh around 2oz, while even jumbo eggs only weigh 2.5oz, according to USDA regulations.
An average hen's egg has a circumference of 5.5 inches is 2.3 inches long.
Hongwei Xin, director of Iowa State University's egg industry centre, told the Des Moines Register: 'It's big. It's twice the size of a large egg.
But Sean Skeehan, who raises chickens at Blue Gate Farm, Chariton, said Australorp eggs usually weigh around 3oz, and an egg the size of Aussie's is not unheard of.
The newspaper reports Mr Batten hopes to contact the Guinness Book of World Records to see if Aussie can make the list - but he may be disappointed.
