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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.
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 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]
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.
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 clutch size is almost always two eggs. [36] Occasionally, however, a female will lay her eggs in the nest of another pair, leading to three or four eggs in the nest. [38] The eggs are white, 6.6 ml (0.23 imp fl oz; 0.22 US fl oz), 2.57–2.96 cm (1.01–1.17 in) long, 2.06–2.30 cm (0.81–0.91 in) wide, 6–7 g (0.21–0.25 oz) at laying ...
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 ...
The name gang-gang comes from a New ... but otherwise look similar to the adult female. The birds are not easily mistaken ... The birds will lay 2-3 white eggs, the ...