The platypus is one of the only mammals on Earth that lays eggs instead of giving birth, breaking one of the most basic rules of biology. Despite producing milk and being classified as a mammal, it ...

Add Yahoo as a preferred source to see more of our stories on Google. Animals reproduce in a variety of fascinating ways. Some species, including humans and many other mammals, give birth to live ...

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 ...

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 ...

In the aftermath of Earth’s most catastrophic extinction event, one unlikely survivor rose to dominate a shattered world: ...

Epaulette sharks can reproduce without any measurable increase in energy use, stunning researchers who expected egg-laying to be costly. Scientists tracked metabolism, blood, and hormone levels ...

Scientists discover the first fossil egg of a mammal ancestor, offering new clues to how Lystrosaurus survived extreme ...

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