Feathers were all the rage in the Jurassic Era. A newly discovered dinosaur fossil with long plumage tells scientists why the animals had such features at all. They believe the K. zabaikallicus had scales and feathers, using the latter as insulation and possibly for mating signals. Though feathered dinosaurs have been associated with modern birds, it wasn't until later that feathers would aid in flight. Researchers now believe many more dinosaurs than previously thought had feathers, possibly all of them.