Cretaceous period

A broken Tyrannosaurus tooth found embedded in the skull of an Edmontosaurus provides rare, direct evidence of a violent encounter between predator and prey at the end of the dinosaur age. Credit: Jenn Hall

Tyrannosaurus tooth found stuck in dinosaur skull reveals violent attack from the Cretaceous period

A rare fossil preserved at the University of Montana's Museum of the Rocky Mountains provides an unusual glimpse into predator-prey relationships at the end of the dinosaur age. It is
Colonies of ants began growing mushrooms when an asteroid hit Earth 66 million years ago. This damage caused mass extinction but also created ideal conditions for fungi to flourish. This is how an evolutionary partnership was created that became even closer 27 million years ago and continues to this day. Credit: Don Parsons

Ant farming began 66 million years ago following the asteroid that doomed the dinosaurs

Smithsonian Institution scientists compiled and analyzed an extensive genetic database, and found that some mushroom crops became completely dependent on ants 27 million years ago, a process created 65 million years ago by an event
The extinction of the dinosaurs. Illustration: shutterstock

The dinosaurs thrived before the asteroid hit wiped them out