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Some species begin incubation with the first egg, causing the young to hatch at different times; others begin after laying the second egg, so that the third chick will be smaller and more vulnerable to food shortages. Some start to incubate after the last egg of the clutch, causing the young to hatch simultaneously. [10] Incubation periods for ...
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 ]
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]
Colours include white, green, blue or brown with spots or speckles in black or lilac. After laying, the female will look at the egg before starting the first incubation shift. [43] Both parents incubate the egg using a single, centrally located brood patch for the 28 to 34 days to hatching in shifts of 1–38 hours. [39]
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 males. An incubation temperature of 30 °C results in an equal ratio of male to female hatchlings. [67]
In all albatross species, both parents incubate the egg in stints that last between one day and three weeks. Incubation lasts around 70 to 80 days (longer for the larger albatrosses), the longest incubation period of any bird. It can be an energetically demanding process, with the adult losing as much as 83 g (2.9 oz) of body weight a day. [43]
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 ...