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They build a bulky cup nest in a shrub or tree, close to the ground. Eggs are light blue in color, and clutch size ranges from 1–5, with 2–3 eggs most common. Both parents take turns feeding the young birds.
Birds which build in trees generally have blue or greenish eggs, either spotted or unspotted, while birds that build in bushes or near or on the ground are likely to lay speckled eggs. The color of individual eggs is also genetically influenced, and appears to be inherited through the mother only, suggesting the gene responsible for ...
Eggs are 14–18 mm (0.55–0.71 in) long and 10.7–13.5 mm (0.42–0.53 in) wide. Egg size appears to depend mostly on the size of individual females and secondarily on habitat, with smaller eggs found at higher altitudes. The clutch's total weight can be 1.5 times as heavy as the female bird. [22] Juvenile in Pimlico, London
The blue-footed booby is one of only two species of booby that raises more than one chick in a breeding cycle. The female blue-footed booby lays two or three eggs, about four to five days apart. Both male and female take turns incubating the eggs, while the nonsitting bird keeps watch.
A study using digital photography and spectrometry along with an automatic analytical approach to analyse cuckoo eggs and predict the identity of bird females based on their egg appearance showed that individual cuckoo females lay eggs with a relatively constant appearance, and that eggs laid by more genetically distant females differ more in ...
Construction of the nest is done primarily by the female and takes around 10 days to complete. These nests are small, cup-like structures lined with grass, feathers, stems, and hairs. Each female lays three to seven light-blue or, rarely, white eggs. The female incubates the eggs, which hatch after 13 to 16 days.
Northern gannets lay one egg that on average weighs 104.5 g (3 + 5 ⁄ 8 oz), [99] which is light for such a large seabird. [100] The egg is around 79 mm (3 + 1 ⁄ 8 in) long by 50 mm (2 in) wide and the shell is pale blue and translucent initially before fading to a chalky white surface that is easily stained. [98]
They started egg-laying earlier, had higher nesting success and lower predation rates, and fledged more young in boxes than in cavities, but they did not have larger clutches of eggs. The eggs are commonly two to eight per clutch, with average size 20.8 mm × 16.2 mm (0.82 in × 0.64 in). Eggs are oval in shape with a smooth and glossy shell.