A remarkable 94-million-year-old fossil found in South America is shedding new light on the ancient history of mammals.

A well-preserved fossil discovered in China provides new evidence that the split between placental mammals and marsupials may have occurred 35 million years earlier than previously believed.

Paleontologists have discovered that an improved sense of smell jumpstarted brain evolution in the ancestral cousins of present-day mammals.

Mediterranean landscapes have undergone great change in recent decades, but species have adapted to this, at least in the case of roe deer, Spanish ibex, red deer and wild boar.

The nine-month pregnancy in humans is influenced by the structure of the placenta.