German China
Lystrosaurus embryo within its partially preserved shell , reconstruction of the animal (Source: Professor Julien Benoit/ Sophie Vrard)
Extraordinary Fossil

First-Ever Egg of a Mammal Ancestor Discovered

The first fossil egg ever found from a mammal ancestor is offering rare insight into how Lystrosaurus survived Earth’s greatest mass extinction. The discovery not only settles a long-running question about early mammalian reproduction, but also points to egg-laying and rapid development as key survival traits in a hostile prehistoric world.

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