An article published in the journal “Current Biology” describes a research showing that there was a rapid evolution of mammals during the Jurassic period, between 200 and 145 million years ago. That period and in general the Mesozoic era, between 252 and 66 million years ago, were the dinosaurs era so we tended to think that mammals lived in their shadow, in ecological niches, such as nocturnal insectivores. Instead, the discovery of new fossils in recent years showed a series of adaptations with a previously unknown diversification.