Chicken laying egg a short video of a chicken laying a white egg in a single close up shot.
ABOUT CHICKENS: https://en.wikipedia.org/wiki/Chicken
The chicken (Gallus gallus domesticus) is a domesticated junglefowl species, with attributes of wild species such as the grey and the Ceylon junglefowl that are originally from Southeastern Asia.
Originally raised for cockfighting or for special ceremonies, chickens were not kept for food until the Hellenistic period (4th–2nd centuries BC).
Humans now keep chickens primarily as a source of food (consuming both their meat and eggs) and as pets.
Chickens are one of the most common and widespread domestic animals, with a total population of 23.7 billion as of 2018. There are more chickens in the world than any other bird. There are numerous cultural references to chickens – in myth, folklore and religion, and in language and literature.
Genetic studies have pointed to multiple maternal origins in South Asia, Southeast Asia, and East Asia, but the clade found in the Americas, Europe, the Middle East and Africa originated from the Indian subcontinent. From ancient India, the chicken spread to Lydia in western Asia Minor, and to Greece by the 5th century BC. Fowl have been known in Egypt since the mid15th century BC, with the "bird that gives birth every day" having come from the land between Syria and Shinar, Babylonia, according to the annals of Thutmose III.
Chickens farmed primarily for eggs are called layer hens. Some hen breeds can produce over 300 eggs per year, with "the highest authenticated rate of egg laying being 371 eggs in 364 days". After 12 months of laying, the commercial hen's egglaying ability starts to decline to the point where the flock is commercially unviable.

ABOUT EGGS: https://en.wikipedia.org/wiki/Egg
EGGLAYING REPRODUCTION:
Animals are commonly classified by their manner of reproduction, at the most general level distinguishing egglaying (Latin. oviparous) from livebearing (Latin. viviparous).
These classifications are divided into more detail according to the development that occurs before the offspring are expelled from the adult's body.
OVULIPARITY means the female spawns unfertilized eggs (ova), which must then be externally fertilised. Ovuliparity is typical of bony fish, anurans, echinoderms, bivalves and cnidarians. Most aquatic organisms are ovuliparous. The term is derived from the diminutive meaning "little egg".
OVIPARITY is where fertilisation occurs internally and so the eggs laid by the female are zygotes (or newly developing embryos), often with important outer tissues added (for example, in a chicken egg, no part outside of the yolk originates with the zygote). Oviparity is typical of birds, reptiles, some cartilaginous fish and most arthropods. Terrestrial organisms are typically oviparous, with eggcasings that resist evaporation of moisture.
OVOVIVIPARITY is where the zygote is retained in the adult's body but there are no trophic (feeding) interactions. That is, the embryo still obtains all of its nutrients from inside the egg. Most livebearing fish, amphibians or reptiles are actually ovoviviparous. Examples include the reptile Anguis fragilis, the sea horse (where zygotes are retained in the male's ventral "marsupium"), and the frogs Rhinoderma darwinii (where the eggs develop in the vocal sac) and Rheobatrachus (where the eggs develop in the stomach).
HISTOTROPHIC VIVIPARITY means embryos develop in the female's oviducts but obtain nutrients by consuming other ova, zygotes or sibling embryos (oophagy or adelphophagy). This intrauterine cannibalism occurs in some sharks and in the black salamander Salamandra atra. Marsupials excrete a "uterine milk" supplementing the nourishment from the yolk sac.
HEMOTROPHIC VIVIPARITY is where nutrients are provided from the female's blood through a designated organ. This most commonly occurs through a placenta, found in most mammals. Similar structures are found in some sharks and in the lizard Pseudomoia pagenstecheri. In some hylid frogs, the embryo is fed by the mother through specialized gills.
The term hemotropic derives from the Latin for bloodfeeding, contrasted with histotrophic for tissuefeeding.

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Isolated by Kevin MacLeod is licensed under a Creative Commons Attribution 4.0 license. https://creativecommons.org/licenses/...
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