Animals reproduce in a variety of fascinating ways. Some species, including humans and many other mammals, give birth to live ...

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

An expedition through an unpredictable, perilous mountain range in Indonesia’s province of Papua led to the rediscovery of a critically endangered egg-laying mammal that hasn’t been seen for more than ...

Most people assume that only reptiles, fish, and birds lay eggs — after all, that’s what we learned in school. But nature always has a few surprises up its sleeve. Believe it or not, there are ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Australia’s ...

As fellow mammals, you and your pet dog or cat have a lot in common. It’s easy to see the similarities because humans, dogs and cats spend lots of time together. We may even be roommates or family.

A couple of decades ago, in my herpetology class at the University of Georgia, we were discussing evolutionary ecology and someone asked the age-old question, “Which came first, the chicken or the egg ...

To pry open the mysteries of our planet's past, scientists typically study rocks and fossilized bones. Eggs are an often overlooked but extremely rich source of information, with birds, reptiles, ...

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 ...