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Ostrich eggs are the largest of all eggs, [4] though they are actually the smallest eggs relative to the size of the adult bird — on average they are 15 cm (5.9 in) long, 13 cm (5.1 in) wide, and weigh 1.4 kilograms (3.1 lb), over 20 times the weight of a chicken's egg and only 1 to 4% the size of the female. [5]
The male and female alternate to sit on the eggs with the female doing duty in the day and the male in the night. Some birds can lay up to 100 eggs during the breeding season with an egg being laid every one or two days. During this period the male ostriches become very aggressive protecting both the female and the eggs. [citation needed]
Ostrich eggs are vulnerable to many predators ranging from mongooses and Egyptian vultures, to hyenas. [20] Snakes of the genera Dasypeltis and Elachistodon specialize in eating eggs. Humans have a long history of eating eggs, both wild bird eggs and farm-raised bird eggs. [citation needed]
They are the heaviest and largest living birds, with adult common ostriches weighing anywhere between 63.5 and 145 kilograms and laying the largest eggs of any living land animal. [3] With the ability to run at 70 km/h (43.5 mph), [ 4 ] they are the fastest birds on land.
The eggs measure about 9 by 14 cm (3.5 by 5.5 in) – only ostrich and emu eggs are larger. The male incubates those eggs for 50–52 days, removing or adding litter to regulate the temperature, then protects the chicks, which stay in the nest for about 9 months. He defends them fiercely against all potential predators, including humans.
Kiwi are notable for laying eggs that are very large in relation to their body size. A kiwi egg may equal 15 to 20 percent of the body mass of a female kiwi. The smallest species of kiwi is the little spotted kiwi , at 0.9 to 1.9 kilograms (2.0–4.2 lb) and 35 to 45 centimetres (14–18 in).
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The major female lays on average 2 eggs per day and will spend a subsequent 15–90 minutes incubating, then will periodically leave the nest unattended to allow minor females to copulate with the territorial male and lay eggs in the nest. The male will often spend more time incubating the nest than the major female.