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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). [18]
The largest (both heaviest and tallest) flightless bird, which is also the largest living bird in general, is the common ostrich (2.7 m, 156 kg). Many domesticated birds, such as the domestic chicken and domestic duck , have lost the ability to fly for extended periods, although their ancestral species, the red junglefowl and mallard ...
Comparison of a kiwi, ostrich, and Dinornis, each with its egg. Ratite birds are strictly flightless and their anatomy reflects specializations for terrestrial life. The term "ratite" is from the Latin word for raft, ratis, because they possess a flat breastbone, or sternum, shaped like a raft.
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Kiwi eggs can weigh up to one-quarter the weight of the female. Usually, only one egg is laid per season. The kiwi lays one of the largest eggs in proportion to its size of any bird in the world, [34] [a] so even though the kiwi is about the size of a domestic chicken, it is able to lay eggs that are about six times the size of a chicken's egg ...
The kiwi genus, Apteryx, is endemic to New Zealand; 44% of the bird species native to New Zealand are endemic. [4] Kiwi are placed in the ratite family, which also includes the emu, ostrich, rhea, [7] and cassowary, as well as the extinct moa of New Zealand and elephant birds of Madagascar. All ratites are flightless. [8]
Eggs of: ostrich, emu, kiwi and chicken ear-coverts Small covert feathers located behind a bird's eye, in one to four rows, which cover the ear opening (bird ears have no external features [159]) and may aid in the acuity of bird hearing. [160] egg
Ostrich oil is another product that is made using ostrich fat. Ostriches are of the genus Struthio in the order Struthioniformes , part of the infra-class Palaeognathae , a diverse group of flightless birds also known as ratites that includes the emus , rheas , cassowaries , kiwis and the extinct elephant birds and moas .