Often considered the “first bird”, Archaeopteryx lived during the Late Jurassic (about 150 million years ago). This small, feathered dinosaur, about the size of a modern raven, measured around 1.5 feet (0.5 meters) in length and had a mix of avian and dinosaurian traits. It possessed teeth, clawed wings, and a bony tail like a dinosaur but had feathers and possibly the ability for limited powered flight or gliding.