An incredible animation has been released showing how a fertilised egg grows into a baby, over the nine months of pregnancy. Failed Science, a Twitter account tweeting gifs, images and videos of ...

Our earliest vertebrate (animals with backbones) ancestors laid eggs, but over millions of years of evolution, some species began to give birth to live young. There is a traditional dichotomy in ...

As a rule, reptiles lay eggs, while mammals deliver young through live birth. According to new research, however, this distinction is a bit more fluid than most assume—for reptiles, at least. Ancient ...