It was first thought to be on of the earliest mammals.

Filial emotions, such as a human mother's love for her offspring, seem to have evolved among early mammals.

"We found 10 skulls just today, early mammals and lizards."

Eozostrodon was one of the largest early mammals, measuring more than a meter long.

As with most early mammals, the classification of Eozostrodon is uncertain.

The earliest mammals were shrewlike creatures that appeared some 200 million years ago.

These early mammals developed many traits which were to make them well-suited for a very active lifestyle.

It is even possible that the earliest mammals also slept with half a brain.

Yet they are related to thought in profound ways because our nocturnal ancestors, the early mammals, lived by smell.

This change may have allowed these early mammals to hunt insects at night when dinosaurs were not active.