He was too tired to explain.

‘I think you are from Thulcandra, Small One,’ said the sorn.

‘Why?’ said Ransom.

‘You are small and thick and that is how the animals ought to be made in a heavier world. You cannot come from Glundandra, for it is so heavy that if any animals could live there they would be flat like plates—even you, Small One, would break if you stood up on that world.