Why did our ancestors ditch the shell and start growing babies inside their bodies instead? In this episode of Big Ideas, ...

In this episode of Big Ideas, from the team behind Deep Look, Niba zooms out to explore one of evolution’s biggest plot twists: how eggs evolved, how they conquered land, and why ...

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 ...

Outliers among mammals, monotremes lay eggs instead of giving birth to live young. Only two types of monotremes, the platypus and echidna, still exist, but more monotreme species were around about 100 ...

Biologists have confirmed the existence of a 200-million-year-old species of egg-laying mammal that has been assumed to be extinct. Suspected footage of Zaglossus attenboroughi -- the long-beaked ...

Quick Take Platypuses are monotremes, one of the oldest branches of mammals, and they reproduce by laying eggs instead of giving birth to live young. Unlike most mammals, platypuses secrete milk ...