The largest eggs laid by a modern bird are those of the ostrich Struthio camelus Linnaeus, a North African species of flightless bird belonging in the ratite order.
Ostrich eggs are about 2.8x the size of a chicken egg. A typical grocery-store chicken egg of Gallus domesticus is shown below for comparison.
Left side: ostrich egg 6 inches high [= 15.3 cm], 4.75 inches wide [= 12 cm].
Right side: typical chicken egg 2.2 inches high [= 5.6 cm], 1.6 inches wide [= 4 cm].
The ostrich egg shown above is empty, but it probably originally weighed about three pounds. Chicken eggs weigh about 1/20 of an ostrich egg (before being emptied).
According to Wikipedia, the incubation period for an ostrich is 35 to 45 days, and they can live up to 62 years, making them one of the longest-living bird species.
Also according to Wikipedia, the average incubation period for a typical “laying hen” is 21 days. Chickens belong to order Galliformes.
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