What broad animal group is thought to have evolved from theropod dinosaurs around 150 million years ago?
reptiles
insects
mammals
birds
Birds are thought to have evolved from theropod dinosaurs around 150 million years ago. Their ancestor may have been similar to the extinct theropod Deinonychus, whose fossils convinced most scientists that birds evolved from dinosaurs. Scientist still don’t know how or why wings and flight evolved, but they continue to search for answers.