The earliest reptiles, birds and mammals may have borne live young, researchers from Nanjing University and University of Bristol have revealed. Until now, the hard-shelled egg was thought to be the ...

Add Yahoo as a preferred source to see more of our stories on Google. Fluffy yellow chick hatching out of brown egg on a black background.jpg You've heard the age-old riddle: "Which came first: the ...

Despite evidence that the earliest examples of creatures such as mammals and reptiles gave birth to live young, they actually may have laid eggs, a scientist argues. Subscribe to read this story ...