Ostrich eggs are the largest of all eggs (and by extension, the yolk is the largest single cell), though they are actually the smallest eggs relative to the size of the adult bird. On average they are 15 centimetres (5.9 in) long, 13 centimetres (5.1 in) wide, and weigh 1.4 kilograms (3.1 lb), over 20 times the weight of a chicken egg.
An ostrich egg, at 3.3 pounds is the largest single cell that exists today on our planet. It's also the largest egg, and it looks about the size of a medium cantaloupe. (Some of the dinosaurs had larger eggs. There's a dinosaur egg in the American Museum of Natural History in New York that's about the size of basketball.) For comparison, the smallest bird egg is the bee hummingbird. You could put 4700 bee hummingbird eggs inside one ostrich egg. The bee hummingbird egg is the size of a small pea and weighs .02 ounces.
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