Pterosaurs—the giant, leathery flying creatures of the age of the dinosaurs—were giant reptiles, NOT dinosaurs. The pterosaurs had slim bodies and thin-walled, lightweight bones, ideal for flying. They thrived for 160 million years, passing into history after the same asteroid strike that finished off the large dinosaurs. Today’s birds are modern-day dinosaurs, descended from creatures similar to the terrifying T-Rex. Learn more at BirdNote.org.