When we think of mammals, we usually think of animals that give birth to live babies, like lions or humans. But there’s a small and rare group of mammals that do things differently– they lay eggs!

Most mammals give birth to live babies except for one or two like the echindea which lays eggs. Mums produce milk to feed their babies. And just like me and you, mammals breathe air with their ...

Mammals give birth to babies, reptiles pop out eggs, right? An ancient fossil unearthed in China suggests the latter wasn't always true. Paleontologists have found a 245-million-year-old fossil of ...

Today, birds and crocodiles just lay eggs. But most mammals aside from the platypus and some snakes, lizards, fish, and amphibians give live birth. An examination of some of these species’ gestation ...

Researchers suggest that ground-based mammals fared better than their arboreal relatives during the end-Cretaceous extinction thanks to their lifestyle.

Como Park Zoo and Conservatory in St. Paul, Minnesota announced that it welcomed a two-toed sloth on Wednesday, much to the surprise and delight of the guests who got to witness the rare moment ...

The belly button, or navel, is a scar that forms after the umbilical cord is detached shortly after birth. The umbilical cord ...

But they're also pretty unusual on the inside: Female kangaroos have two vaginas — or three, if they've given birth. Why could that be? The most likely explanation is that it's an adaptation to ...

Allie, a 37-year-old bottlenose dolphin, has entered her third trimester of a 12-month pregnancy. She is expected to give birth in June.