O is for Ornithomimus

Ornithomimus was an ornithomimid theropod from the Late Cretaceous of North America, about 70 million years ago. It&amp;#8217;s estimated to have reached around 3.8m in length (12&amp;#8217;5&amp;#8221;). Three specimens have been found with evidence of feathers: a juvenile with hair-like &amp;#8220;fuzz&amp;#8221;, and two adults with quill knobs on the arm bones. It seems that these dinosaurs developed wing-like feathers at sexual maturity, possibly using them for mating displays similarly to modern ostriches.

The ornithomimids (&amp;#8220;bird mimics&amp;#8221;) were named for their superficial resemblance to large flightless birds. They had long legs adapted for speed, relatively small heads, and sloth-like arms. They were the most common small dinosaur in North America, suggesting they were probably herbivores &amp;#8212; or possibly omnivores supplementing a plant diet with small prey.

And they&amp;#8217;re flocking this way.