The largest egg among living birds is laid by the ostrich.

The egg weighs 1.4 K.G (~ 3 pounds) but forms

only 1.4% of the body weight of the bird.

Smaller birds lay proportionately larger eggs.

The largest egg by % of body weight is laid by

Kiwi the small flightless bird of New Zealand.

Its egg weighs only 0.5 kilogram but

it is 20% of the bird’s body weight!