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 ...

The answer is no parent is better than another. Any species still around has been on the right track regarding parental care. In seeking to unravel mysteries of the natural world, ecologists try to ...

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.

Scientists are studying Nectophrynoides frogs that give birth to live young. This unique reproductive method helps them ...

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 ...