The wingspan of the largest species of pteranodon (the term employed by working paleontologists as opposed to the culturally popular term "pterodactyl") was up to 30 feet. This wingspan is much larger than that of any modern flying bird.
Tyrannosaurus rex primarily ate herbivore dinosaurs, including the Edmontosaurus and the Triceratops. Studies suggest that the Tyrannosaurus rex also practiced cannibalism. Paleontologists believe that if two Tyrannosaurus rex dinosaurs fought to the death, the winner would eat the loser, based on bite marks found on Tyrannosaurus bones.
Scientists approximate dinosaur lifespan by attempting to determine the metabolism of the animal, looking at its size and bone growth, and comparing with similar animals that are still around today. Based on these factors, a stegosaurus may have lived 75 to 100 years.