Add Yahoo as a preferred source to see more of our stories on Google. Q. When we studied high school biology, our teacher said more than 99% of animals lay eggs and only a few give live birth. That ...

Why did our ancestors ditch the shell and start growing babies inside their bodies instead? In this episode of Big Ideas, from the team behind Deep Look, Niba zooms out to explore one of evolution’s ...

The fossilized remains of a Lystrosaurus now answers the question scientists have asked for years: Did mammals once lay eggs?

Beyond birds, a surprising array of animals reproduce by laying eggs. From the unique monotremes like the platypus and echidna to reptiles, amphibians, and intelligent octopuses, this ancient strategy ...

Q. When we studied high school biology, our teacher said more than 99% of animals lay eggs and only a few give live birth. That percentage seems too high. Humans, dogs, cats and cows are ...