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A sea turtle clutch. A clutch of eggs is the group of eggs produced by birds, amphibians, or reptiles, often at a single time, particularly those laid in a nest. In birds, destruction of a clutch by predators (or removal by humans, for example the California condor breeding program) results in double-clutching. The technique is used to double ...
While a single specific cause is unknown, chronic egg laying is believed to be triggered by hormonal imbalances influenced by a series of external factors. [1] As in the domestic chicken, female parrots are capable of producing eggs without the involvement of a male – it is a biological process that may be triggered by environmental cues such as day length (days becoming longer, indicating ...
The number of eggs laid in a single brood is referred to as the clutch. Clutch size is usually within a small range of variation. Some birds respond to the accidental loss of eggs by laying a replacement egg. Others will stop laying based on the apparent size of the clutch.
The egg-viability hypothesis states that high temperatures favour small clutches because of a reduction in egg viability. [18] This explains the reason why when Red-winged Blackbirds – which are open nesters - lay large eggs at low latitudes, female birds initiate clutch incubation before the clutch completion. [18]
In Costa Rica it nests from December to June, with most pairs laying the first egg in January. [24] [36] The male macaw only has semen available during the breeding season; the semen has a low sperm concentration. [42] The female lays a clutch of 2–3 eggs [40] and incubates them for 26 days.
The red-shouldered macaw nests in a hole in a tree. There are usually three or four white eggs in a clutch. The female incubates the eggs for about 24 to 26 days, and the chicks fledge from the nest about 54 days after hatching. [14]
Highly pathogenic avian influenza, commonly called bird flu, has killed or caused the culling of hundreds of millions of poultry globally in recent years, most of them laying hens, which sent egg ...
The breeding season is November to March, with most eggs hatching in January to coincide with the start of the Caatinga January to April rainy season. In the wild, Spix's were believed to lay three eggs per clutch; in captivity, the average number is four eggs, and can range from one to seven. [18]