probably evolved from the maniraptors, a branch of bird-like dinosaurs 
. The Archaeopteryx is the oldest known fossil bird, and dates from the late Jurassic period (about 150 million years ago). It is now extinct. Although it had feathers and could fly, it had similarities to dinosaurs, including its teeth, skull, and certain other bone structures.
The most bird-like dinosaur ever discovered is the 90-million-year-old Unenlagia comahuensis, a flightless, 4-foot tall, 7.5-foot long carnivore (the size of an ostrich, but shaped like Velociraptor). Unenlagia could grasp using its wing-like forearms. This new fossil helps show how dinosaur forearms evolved into the wings of modern-day birds.
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