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 ...

For the first time since 1961, researchers have rediscovered the elusive Attenborough’s long-beaked echidna in the remote rainforests of Indonesia. An expedition crew led by Oxford University ...

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.

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 ...