 But the discovery since the early 1990s of many feathered dinosaurs means that "Archaeopteryx" is no longer the key figure in the evolution of bird flight.Other small feathered coelurosaurs from the Cretaceous and Late Jurassic show possible precursors of avian flight.These include "Rahonavis", a ground-runner with a "Velociraptor"-like raised sickle claw on the second toe, that some paleontologists assume to have been better adapted for flight than "Archaeopteryx", "Scansoriopteryx", an arboreal dinosaur that may support the "from the trees down" theory, and "Microraptor", an arboreal dinosaur possibly capable of powered flight but, if so, more like a biplane, as it had well-developed feathers on its legs.