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Typically, they lay 2–4 eggs in with those already present. The eggs of both the host and the victim are white, although the indigobird's are slightly larger. Many of the indigo-plumaged species named "indigobirds" are very similar in appearance, with the males difficult to separate in the field, and the young and females near impossible.
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.
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]
Birds of a pair copulate frequently until the female is laying eggs, and the male mounts the female repeatedly each time a pair mates. [133] The house sparrow is monogamous, and typically mates for life, but birds from pairs often engage in extra-pair copulations, so about 15% of house sparrow fledglings are unrelated to their mother's mate. [136]
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.
The male finishes the nest only after finding a mate. The female lays about two to four white eggs and incubates them for about 14 to 17 days. [40] Males may sometimes assist in feeding the chicks. The chicks leave the nest after about 17 days. [16] After mating with a female the male typically court other females at other partially constructed ...
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]
Female nighthawks do not build nests; instead, they lay their eggs directly on the ground. To shield their eggs from potential predators, the females rely on their natural camouflage. [ 2 ] Living in warm, desert areas means that the female must not leave her eggs in one spot in the heat for too long, therefore, she will periodically move her ...