Template:POTD/2021-02-10: Difference between revisions
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|texttitle=Bird egg |
|texttitle=Bird egg |
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|alttext=Cross-sectional diagram of a chicken egg |
|alttext=Cross-sectional diagram of a chicken egg |
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|caption |
|caption |
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'''[[Bird egg]]s''' are laid by females and [[Egg incubation|incubated]] for a variable duration depending on the species. This diagram shows a cross-section of a [[chicken]] egg on its ninth day of incubation. The [[embryo]] is surrounded by the [[amnion]], a membrane that fills with amniotic fluid and cushions it against shock; the [[allantois]] helps the embryo obtain oxygen and handles metabolic waste; the [[Yolk|vitellus]], or yolk, is the nutrient-bearing portion of the egg, containing most of its fat, minerals, and many of its proteins and blood vessels; the [[chorion]] forms the [[amniotic sac]] and encloses the other structures; the [[Egg white|albumen]] protects the yolk and embryo and provides additional nutrients; the porous shell allows oxygen to enter while keeping unwanted fluids and contaminants out. |
'''[[Bird egg]]s''' are laid by females and [[Egg incubation|incubated]] for a variable duration depending on the species. This diagram shows a cross-section of a [[chicken]] egg on its ninth day of incubation. The [[embryo]] is surrounded by the [[amnion]], a membrane that fills with amniotic fluid and cushions it against shock; the [[allantois]] helps the embryo obtain oxygen and handles metabolic waste; the [[Yolk|vitellus]], or yolk, is the nutrient-bearing portion of the egg, containing most of its fat, minerals, and many of its proteins and blood vessels; the [[chorion]] forms the [[amniotic sac]] and encloses the other structures; the [[Egg white|albumen]] protects the yolk and embryo and provides additional nutrients; the porous shell allows oxygen to enter while keeping unwanted fluids and contaminants out. |
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