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However, the average clutch size is 26 eggs laid by 7 different females. [4] Rhea eggs measure about 130 mm × 90 mm (5.1 in × 3.5 in) and weigh 600 g (21 oz) on average; they are thus less than half the size of an ostrich egg. Their shell is greenish-yellow when fresh but soon fades to dull cream when exposed to light.
The male may use another subordinate male to incubate his eggs while he finds another group of females to start a second nest with. [13] The chicks hatch within 36 hours of each other. Right before hatching, the chicks begin to whistle. [27] The group of females, meanwhile, may move on and mate with other males.
The traditional modes of reproduction include oviparity, taken to be the ancestral condition, traditionally where either unfertilised oocytes or fertilised eggs are spawned, and viviparity traditionally including any mechanism where young are born live, or where the development of the young is supported by either parent in or on any part of their body.
The eggs are white and large, [5] and weigh approximately 6 to 7 ounces. [2] The eggs have a relatively low fertility rate, with only about 50% of them hatching. [2] The females usually set on 8 to 10 eggs at a time and hatching will begin after approximately 30 days. [6]
Genus Rhea Brisson 1760; References This page was last edited on 2 October 2024, at 20:06 (UTC). Text is available under the Creative Commons Attribution ...
A family of Rhea pennata pennata in the wild in Chile, 2006 Head of a Darwin's rhea at the Edinburgh Zoo. The lesser rhea stands at 90 to 100 cm (35–39 in) tall. Length is 92 to 100 cm (36–39 in) and weight is 15 to 28.6 kg (33–63 lb).
Other reports found only a few fertile eggs were produced and very few resulted in advance embryos. [17] [18] [19] According to Olsen, [20] 23 hybrids were obtained from 302 embryos which resulted from 2,132 eggs. Dark Cornish cockerels and Rhode Island Red cockerels successfully fertilised turkey eggs.
The process may have originally occurred as a result of people hatching and rearing young birds from eggs collected from the wild, but later involved keeping the birds permanently in captivity. Domesticated chickens may have been used for cockfighting at first [ 5 ] and quail kept for their songs, but people soon realised the advantages of ...