Animals reproduce in a variety of fascinating ways. Some species, including humans and many other mammals, give birth to live young that develop inside the mother’s body. Others reproduce through less ...

Birds may be the most famous egg-layers, but they’re far from the only ones! Across the animal kingdom, reptiles, amphibians, fish, and even a few rare mammals rely on this ancient method of ...

Even within the world of egg-laying animals, there is an incredible variety of reproductive strategies. Some species mate before the female lays her eggs, ensuring they are fertilized internally, ...

When you think of animals that lay eggs, birds are probably the first to come to mind. But nature is far more diverse than that. Egg-laying is one of the oldest and most widespread ways of ...

Why did our ancestors ditch the shell and start growing babies inside their bodies instead? In this episode of Big Ideas, from the team behind Deep Look, Niba zooms out to explore one of evolution’s ...

Eggs helped animals conquer land—but most mammals stopped laying them. Why is that? Why do most animals lay eggs, while humans and most mammals give birth to live young? In this episode of Big Ideas ...