Although Pterodactyls lived around the same time as dinosaurs, they are not considered dinosaurs. Initially, paleontologists did not have a specific description for how dinosaurs looked which caused them to confuse pterodactyls for dinosaurs at one point in time. read more
Both pterosaurs and dinosaurs are distinct groups that shared a common ancestor, and so to call a pterosaur a dinosaur is to ignore this major divergence in the evolution of both groups. A pterosaur is no more a dinosaur than a goldfish is a shark. read more