Duckling Hatch Debris - Pictures

casportpony

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@Ravynscroft and @Pyxis, What's this stuff called?
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Functions of the Embryonic Membranes
Special temporary organs or embryonic membranes forme within the egg, both to protect the embryo and to provide for its nutrition, respiration, and excretion. These organs include the yolk sac, amnion, and allantois.

The yolk sac supplies food material to the embryo. The amnion, by enclosing the embryo, provides protection. The allantois serves as a respiratory organ, gets minerals from the shell, and handles waste. These temporary organs function within the egg until the time of hatching.

http://www.sites.ext.vt.edu/virtualfarm/poultry/poultry_development.html
 

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