"In their evolution, we see that the earliest pterosaurs were small, and yet still unnecessarily heavy and clumsy, both in the air and on the ground, but 160 million years of refinement has honed their abilities to the limit of incidental engineering. Despite their enormity, they were unbelievably lightweight; even the biggest ones were estimated at less than 500 lbs. They had hollow pneumatic bones of large diameter but only millimeters thick, making a strut-supported tubular frame that's surprisingly strong and highly resistant to the stresses of aeronautics. They also had extraordinarily powerful wing muscles, and this made them capable of vaulting airborne in a single bolt. Once in the air, muscle strands and tendons in the membrane of the wing itself worked with a network of pycnofibres to give them all the data they needed for subtle adjustments to the shape of the wing. The portions of the brain which were dedicated to flight, balance and visual gaze stabilization in birds are all larger and more adapted in pterosaurs. In fact, scientists are now convinced that these animals had such a mastery of flight, that the larger ones could even cross oceans, going 80 mph at 15,000 feet for thousands of miles on a single launch."