Bird egg
Videos
A bird egg is the reproductive structure produced by female birds, consisting of a hard, calcareous shell that encloses nutrient-dense yolk, protective albumen, and embryonic membranes, providing a se
Eggs of various birds, labelled (Trinity College Zoological Museum, Dublin)
Guillemot eggs
Almost spherical bird egg (Senegal parrot)
Long, "elliptical" bird egg (Common murre)
Chorion
Videos
The chorion is the outermost fetal membrane around the embryo in mammals, birds and reptiles. It is also present around the embryo of other animals, like insects and molluscs.
Placenta with attached fetal membranes (ruptured at the margin at the left in the image), which consists of the chorion (outer layer) and amnion (inner layer).
Amniotic embryo. a=embryo, b=yolk, c=allantois, d=amnion, e=chorion