A deposit of amber has been found with a dinosaur tail embeded, complete with bones, flesh, skin and feathers.

The feathers weren't flight feathers, but similar to those on a Silkie chicken. On the other hand, attachment points on the arm bones of related Velociraptor were definitely for flight feathers. It couldn't fly, but those wing feathers made it a very effective predator, able to maneuver exceptionally sharply and run up slopes too steep for most prey.