Amniotic egg appears very early in reptilian evolution. Egg has several special extra-embryonic membranes, which allow it to develop on land independent of water. Just as significant as evolution of ...

Most biologists will answer confidently when asked "which came first, the chicken or the egg?" but the answer may depend on what type of egg you're talking about.

According to research, the amniotic eggs made their debut roughly 340 million years ago and the first chickens evolved around 58,000 years ago at the earliest, it’s reasonable to assert that the ...

Evolution of amniotic eggs. At some point, there was a new sort of egg, this time with three more membranes within it: chorion, amnion, and allantois, which began to evolve.