Gallimimus was a fast-running dinosaur with a very long, thin, flattened, toothless, horny beak, a small head, and a relatively large brain. The bottom front part of its beak was shaped like a shovel. It had large eyes positioned on opposite sites of its head, ruling out binocular vision (depth perception). It had a long neck, long tail, and long legs. Gallimimus was about 13-20 ft (4-6 m) long, was 6.3 ft (1.9 m) tall at the hips, and may have weighed about 970 pounds (440 kg).
This oviraptorosaur had short arms with three clawed fingers on each hand, and long legs with three clawed toes on each. A long tail acted as a counterbalance and as a stabilizer during fast turns. Its bones were hollow.
WHEN GALLIMIMUS LIVED
Gallimimus lived in the late Cretaceous period, about 75-70 million years ago.
There is no evidence that Gallimimus gathered in herds.
Gallimimus was a theropod, whose intelligence (as measured by its relative brain to body weight, or EQ) was high among the dinosaurs.