Add Yahoo as a preferred source to see more of our stories on Google. 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 ...

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 ...

Animals with larger brains produce fewer, larger offspring, explaining why birds evolved bigger eggs than the largest dinosaurs.

To keep eggs alive, many birds do something far stranger than simply sitting on them. Their bodies physically transform in ...

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 ...

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 ...

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 ...

Chandler's Wild Life shares a crocodile laying eggs, offering a close look at reptile behavior and wildlife care.

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 ...