Fastest animals
The fastest land animal is the cheetah, which has a recorded speed of . The peregrine falcon is the fastest bird and the fastest member of the animal kingdom with a diving speed of . The fastest animal in the sea is the black marlin, which has a recorded speed of .
Gallimimus
As an ornithomimid, "Gallimimus" would have been a fleet (or cursorial) animal, using its speed to escape predators; its speed has been estimated at 42-56 km/h (29-34 mph). It may have had good vision and intelligence comparable to ratite birds. "Gallimimus" may have lived in groups, based on the discovery of several specimens preserved in a bone bed. Various theories have been proposed regarding the diet of "Gallimimus" and other ornithomimids. The highly mobile neck may have helped locate small prey on the ground, but it may also have been an opportunistic omnivore. It has also been suggested that it used small columnar structures in its beak for filter-feeding in water, though these structures may instead have been ridges used for feeding on tough plant material, indicative of a herbivorous diet. "Gallimimus" is the most commonly found ornithomimosaur in the Nemegt Formation, where it lived alongside its relatives "Anserimimus" and "Deinocheirus". "Gallimimus" was featured in the movie "Jurassic Park", in a scene that was important to the history of special effects, and in shaping the common conception of dinosaurs as bird-like animals.