Even more impossible than the Brontosaurus is the Quetzalcoatlus. It was a dinosaur the size of a giraffe. Its neck was equally long as that of a giraffe, and it walked about on four legs.
Yet it could fly! When spreading out its front legs and fifth finger, it unfolded wings with a total wing-span of 16 meters.
The fact that an animal like that could fly is in itself baffling. However, that is not its only mystery. Its head, including its beak, was half the length of its giraffe-like neck. Instead of a tiny head perched on top of its long neck, like that of a giraffe, it had an enormous head with a giant beak.
Making this all the more mysterious is the fact that these flying monsters were predators. They could catch prey with the tip of their beaks. That would produce a tremendous torque on their necks. It seems that an abrupt movement of their heads would in itself have been sufficient to snap their necks.
Yet, they could hunt and catch prey with ease. They must have been able to move their heads about swiftly and forcefully.
The only way this could be possible is if the inertia associated with their heads was less. With less inertia, there would be less torque. Only a world where everything was substantially less massive would allow an animal like the Quetzalcoatlus to exist.
The Quetzalcoatlus is pretty much definite proof that both inertia and gravity have increased over time, exactly as hypothesised by Halton Arp.