Kaatedocus (small beam) was a sauropod dinosaur that lived during the Jurassic Period in North America. It was the ancestor of the more famous Diplodocus, but one different feature that makes it recognizable is its "toothy smile".
The only known species is Kaatedocus siberi. It is rather small by sauropod standards, only growing 12 to 14 m (40 to 46 ft) long and roughly 8 tons in weight, comparing that to its descendant Diplodocus, which grew to be over 27 m (90 ft) long and 20 tons in weight, and you can see how much smaller it is. It lived during the height of the time of Sauropod dinosaurs during the Mesozoic Era. It lived in the Late Jurassic approximately 155 million years ago. It looks a lot like its descendant Diplodocus, having the same long neck, horizontal body, and whip-like tail, but unlike its relative it had a very toothy grin. Its teeth were much larger than other diplodocids, and were designed to strip plants like ferns instead of chew their food. Like other diplodocids, they weren't as heavily-built as other sauropods, but were relatively very long animals. They couldn't move very fast, but its size protected it from most predators. It had four pillar-like legs that were built to support its massive size instead of sprint away quickly. Like other sauropods, Kaatedocus siberi had a small head on a very long neck, travelled in herds, and swallowed stones called gastroliths to grind their food for them.
In The Land Before Time
A group of three Kaatedocus can be seen drinking from a small lake in the opening of The Land Before Time XIV: Journey of the Brave.