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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 female lays clutches of eggs from February through August, two or more broods per year with 2 to 6 eggs per brood, most commonly 4 or 5. The egg laying usually takes place in the morning, at one egg per day. [17] The eggs are pale bluish-green with few black spots and a smooth, somewhat glossy surface.
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]
These birds forage at night, catching insects in flight, and normally sleep during the day. Eastern whip-poor-wills nest on the ground, in shaded locations among dead leaves, and usually lay two eggs at a time. The bird will commonly remain on the nest unless almost stepped upon. [citation needed] The whip-poor-will has been split into two species.
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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When a parasitic female lays her egg in a host female's nest, the host female experiences a deposition rate of two eggs per day. Host females may recognize parasitic eggs when the egg deposition pattern deviates from the traditional one egg per day pattern. [ 30 ]
The orangequit's breeding season is between the months of April and June. The species will build nests out of grass and plant fiber and place them in trees almost six meters above the ground. The female will typically lay 2–4 eggs at a time and will incubate. The appearance differs according to their sex and age.