Seventy-six million years ago, ornithomimids ("bird-mimic" dinosaurs), would have lived on the coastal plain that was southwestern Alberta. Examples of ornithomimids include Ornithomimus and Struthiomimus.

Ornithomimids bore a superficial resemblence to modern ostriches, although some were much larger than any known ostrich. They had small heads, long necks, thin bodies and very long legs. Instead of wings, ornithomimids had long, agile arms that ended in three fingers tipped with straight claws.

Speed and agility may have been the bird-mimics' first line of defence. Scientists think they may have been able to reach speeds up to 35 kilometres per hour – perhaps the fastest of all the dinosaurs. A rod-like tail helped them change direction at high speeds – a useful ability when trying to avoid predators.

Unlike many other dinosaurs, most ornithomimids had no teeth. Instead, their long, slender jaws ended in bird-like beaks. Some scientists believe they were omnivores, eating both plants and meat.
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