Talk:Bird egg
File:Chicken egg diagram.svg scheduled for POTD edit
Hello! This is to let editors know that the featured picture File:Chicken egg diagram.svg, which is used in this article, has been selected as the English Wikipedia's picture of the day (POTD) for February 10, 2021. A preview of the POTD is displayed below and can be edited at Template:POTD/2021-02-10. For the greater benefit of readers, any potential improvements or maintenance that could benefit the quality of this article should be done before its scheduled appearance on the Main Page. If you have any concerns, please place a message at Wikipedia talk:Picture of the day. Thank you! Cwmhiraeth (talk) 14:03, 22 January 2021 (UTC)
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Bird eggs are laid by females and 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 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 albumen protects the yolk and embryo and provides additional nutrients; the porous shell allows oxygen to enter while keeping unwanted fluids and contaminants out. Diagram credit: KDS4444
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