much more fragile than dinosaur bones. as the authors of the cottage just said in its own good very thin wall with hardly any organic material inside them just the spongy tissue that was ninety percent but when i was used overall weight and therefore increased its flight capability that i knew he cut so very lightweight bones definitely. here in the dinosaur museum and the military island of area the giant pterosaurs reconstructed skeleton goes on display for the first time. how exactly did these creatures move on the ground it's not known for sure but they probably got around on all fours with their wing membranes neatly folded up on the sides. it's also not clear how they managed to become airborne some experts believe they needed to take off from an elevated point rather like