Gallimimus is a dinosaur that lived during the Late Cretaceous period, about 70 million years ago. It belonged to a group of dinosaurs called theropods, which were meat-eaters and walked on two legs. Gallimimus was one of the largest ornithomimosaurs, a type of theropod known for their ostrich-like appearance.

Gallimimus had a slender body, long slender legs, and small sharp teeth. It was about 5 to 6 meters long, with a height of around 2 meters at the hips. Its long neck and tail were adaptations for balance and maneuverability. Despite its size, Gallimimus was lightweight and built for speed. Scientists believe it could run at speeds of up to 60 kilometers per hour, making it one of the fastest dinosaurs.

The diet of Gallimimus is not entirely clear, but its tooth structure suggests it could have been omnivorous, feeding on both plants and small animals. It had a beak-like mouth, similar to modern-day birds, which might have been used to grasp and tear food.

Fossils of Gallimimus have been found in Mongolia, in the Gobi Desert. These fossils provide valuable insights into the behavior and anatomy of this dinosaur. Gallimimus is an important dinosaur for scientists to study because it helps us understand the diversity and adaptations of dinosaurs during the Late Cretaceous period.