It had a pair of longitudinal, plate-shaped crests on its skull, similar to a cassowary with two crests. The snout was narrow, and the upper jaw had a gap or kink below the nostril. It was slender and lightly built, and the skull was proportionally large, but delicate. Dilophosaurus was one of the earliest large predatory dinosaurs, though it was smaller than some later theropods.
At about 7 meters in length, with a weight of about 400 kilograms. The genus name means "two-crested lizard". Dilophosaurusis a genus of theropod dinosaur that lived during the Early Jurassic, about 193 million years ago.Gallimimus was toothless with a keratinous (horny) beak, and had a delicate lower jaw. The snout was long compared to other ornithomimids, although it was broader and more rounded at the tip than in other species. The head was small and light with large eyes that faced to the sides.
The forelimbs were weak while the hindlimbs were proportionally long. The hands were proportionally the shortest of any ornithomimosaur and each had three digits with curved claws. The neck was proportionally long in relation to the trunk. Many of the vertebrae had openings that indicate they were pneumatic (air-filled). As evidenced by its relative Ornithomimus, it would have had feathers. Gallimimus is the largest known ornithomimid adults were about 6 metres long, 1.9 metres tall at the hip and weighed about 440 kilograms.
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