![]() Later, therizinosaurs grew much more massive as they evolved the larger digestive system needed to process plant material. He adds that it had long filamentary feathers, like those of Beipaosaurus, a slightly smaller and more advanced therizinosaur that lived in China at about the same time. ![]() The teeth were leaf-shaped, which Kirkland says is “a first step toward plant eating” from eating meat or insects. ![]() It had more numerous and smaller teeth than its predatory ancestors, but had yet to evolve the beak seen in its plant-eating descendants. Living about 125 million years ago, it was little over 1 metre high and 4 m from nose to tail. ![]() Leaf-shaped teethįalcarius is the most primitive – or least specialised – therizinosaur known, says Kirkland. But the mystery for palaeontologists was how predators evolved into the slower vegetarian lifestyle of therizinosaurs and other plant-eating dinosaurs. ![]()
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