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A female budgerigar will lay her eggs on alternating days. [38] After the first one, there is usually a two-day gap until the next. She will usually lay between four and eight eggs, which she will incubate (usually starting after laying her second or third) for about 21 days each. [38]
There is an inverse relationship between egg weights and laying sequence, [29] wherein earlier eggs are larger than eggs laid later in the sequence. It is possible to induce a female coot to lay more eggs than normal by either removing all or part of her clutch. Sometimes, a female may abandon the clutch if enough eggs are removed.
As the common cuckoo evolves to lay eggs that better imitate the host's eggs, the host species adapts and is more able to distinguish the cuckoo egg. A study of 248 common cuckoo and host eggs demonstrated that female cuckoos that parasitised common redstart nests laid eggs that matched better than those that targeted dunnocks.
The inside of the nest is lined with wool and grass. [2] The nests can be up to 13 centimetres (5.1 in) high and are found in trees or shrubs. [2] Yellow wattlebirds lay 2–3 eggs that are salmon-red, spotted and blotched red-brown, purplish-red and blue-grey. [2] Both the males and females incubate the egg and feed the young. [8]
The females lay 1–2 eggs. At a temperature of 28 °C, the young will hatch after approximately 40–45 days. The juveniles measure 55–60 mm. They should be kept separately since the juveniles can be quite quarrelsome. Sexual maturity is reached after 10–12 months.
The bee hummingbird's breeding season is March–June, with the female laying one or two eggs. [ 17 ] Using strands of cobwebs , bark , and lichen , female bee hummingbirds build a cup-shaped nest about 2.5 cm (1 in) in diameter and 3–5 m (9.8–16.4 ft) off the ground.
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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. Since the blue-footed booby does not have a brooding patch, it uses its feet to keep the eggs warm. The incubation period is 41–45 days. Usually, one or two chicks are ...