The evolution of the amniotic egg -- complete with membrane and shell -- was key to vertebrates leaving the oceans and colonizing the land and air but how bird eggs evolved into so many different ...

The eggs of amniotes - mammals, reptiles and birds – come in a remarkable variety of shapes and sizes. Evolutionary biologists have now addressed shape variety in terrestrial vertebrates' eggs, ...

Q. I saw a photo of different kinds of bird eggs and noted not only the obvious, that smaller birds lay smaller eggs, but also that some bird eggs are elongate whereas others are more rounded. What is ...

One of nature's most efficient life-support systems is the egg. Eggs evolved over 300 million years ago as vertebrate animals adapted to living on land. And since then, they've taken on numerous ...

It’s a mystery that goes back to the days of Aristotle, flummoxing biologists and mathematicians for centuries: Why do birds’ eggs come in so many different shapes and sizes? Why are owl eggs almost ...

Eggs evolved over 300 million years ago and now come in all kinds of shapes, from Tic Tacs to teardrops to pingpong balls. After studying some... How Do Eggs Get Their Shapes? Scientists Think They've ...