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Like other megapodes, Melanesian scrubfowl lay large eggs with a high yolk content (possibly as high as 65-69% of egg content compared to 15-40% in other birds). [16] [18] Melanesian scrubfowl eggs are adapted to surviving underground (e.g., thin egg shells improve gas exchange [3]) during their incubation which lasts between six and ten weeks ...
In the latter, the eggs develop in utero for about 28 days, with only about 10 days of external incubation (in contrast to a chicken egg, which spends about one day in tract and 21 days externally). [11] After laying her eggs, the female curls around them. The incubation period is divided into three phases.
Their eggs are unusual in having a large yolk, making up 50–70% of the egg weight. [5] The birds are best known for building massive nest mounds of decaying vegetation, which the male attends, adding or removing litter to regulate the internal heat while the eggs develop.
[4] [48] [150] The eggs weigh from 93 to 101.6 g (3.28 to 3.58 oz), the upper weight being the mean mass of the first egg and the lower weight being the mean mass of the second egg. [ 4 ] [ 12 ] The eggs are reportedly laid at up to 7 day intervals and may take up nearly seven days as well between hatching. [ 4 ]
The eggs are laid near the water so the hatchlings can return to the sea. [66] The loggerhead's sex is dictated by the temperature of the underground nest. Incubation temperatures generally range from 26–32 °C (79–90 °F). Sea turtle eggs kept at a constant incubating temperature of 32 °C become females. Eggs incubating at 28 °C become ...
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 nestlings hatch in approximate 3- to 5-day intervals. If it is a three-egg clutch, the mean estimated weight of the three hatchlings at the time the final egg hatches is 367 g (12.9 oz), 252 g (8.9 oz) and 98 g (3.5 oz), making the largest chick easily dominant and giving the youngest practically no chance of survival. [71]
One study on the incubation period of the common snapping turtle incubated the eggs at two temperatures: 20 °C (68 °F) and 30 °C (86 °F). The research found that the incubation period at the higher temperature was significantly shorter at approximately 63 days, while at the lower temperature the time was approximately 140 days. [25]