Summary:
- Researchers have discovered the fossilized remains of an ancient egg that provides evidence that some early mammal ancestors laid eggs, rather than giving birth to live young.
- This finding helps solve a longstanding debate about the evolutionary transition from egg-laying to live birth in mammals.
- The discovery of this 150-million-year-old egg sheds light on the diverse reproductive strategies used by our mammalian ancestors as they evolved from reptile-like creatures.