Does the kiwi lay the largest egg?

A kiwi cannot lay more than one egg in a single sitting.

A kiwi lays one large egg (about six times the size of an egg from another bird of the same size) then, 24 days later, lays another egg. The second egg is beginning to develop as soon as the first is laid. On rare occasions, a kiwi may lay a third egg.

The kiwi can lay only one egg at a time, as the egg is huge - about 15-20% of the kiwi's total body weight.