Of these, six species would have coexisted at any one time, including two types of ankylosaurs (tank - like armoured dinosaurs), two types of hadrosaurs (duck - billed dinosaurs), and two types of ceratopsids (horn - faced dinosaurs). (sciencedaily.com)
Since bones from hadrosaurs are especially abundant in the Kaiparowits Formation, Chin suspects those kinds of dinos deposited the dung. (sciencenews.org)
A few years ago, Fassett's colleagues were digging in a fossil - rich area of New Mexico when they uncovered the four - foot - long fossilized thighbone of a duck - billed, plant - eating hadrosaur in a sandstone cliff. (discovermagazine.com)