Not many people have heard of the Oviraptor dinosaur, even though it is a distant relative of T-Rex. However, unlike T-Rex, the Oviraptor was a vegetarian not a meat eater. University of Alberta scientist Scott Persons says this dinosaur had bird-like features including a beak, crest and tail feathers. He believes the creatures would fan their tails to help find a mate and flaunt their wares.  Persons study and the resent discovery of fossilized feathers, led him to believe they were used to attract mates.

Oviraptors lived 145 million years ago and were about the size of a turkey, but they were all dinosaur. However, like other dinosaurs, it had feathers. The conclusion of the study indicates there may be some misconception about the way we think of dinosaurs.

[Source]