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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 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]
Ariidae males carry a clutch of a few dozen eggs in their mouths, [2] for about two months before they hatch. Luciocephalus pulcher; Jawfishes; Osteoglossid are all mouthbrooders. The parents can hold hundreds of eggs in their mouths. Once hatched, the young may make several trips outside the parent's mouth before deciding to leave permanently.
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 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.
Whale shark eggs typically hatch within the mother. At 1.5 kg (3.3 lb) and up to 17.8 cm × 14 cm (7.0 in × 5.5 in), the ostrich egg is the largest egg of any living bird, [ 2 ] : 130 though the extinct elephant bird and some non-avian dinosaurs laid larger eggs.