‘Toad coin?’ wondered the traveler as he examined the pebble. It did not look all that different from any other pebble, and certainly nothing like a coin. ‘What manner of coin has no head or tail, and bears no seal or flag? Who backs this toad coin, the toad bank? The toad treasury!?’ The traveler laughed, but the toads croaked sternly back at him.
‘Absurd!’ scoffed the pterodactyls. ‘We are faster than the frogs, by any measure!’ But the pterodactyls were honorable sportsmen, and they believed themselves bound to oblige a fair challenge. When the day of the race came, the pterodactyls and frogs gathered at the starting line, each side sure of victory. The flag was raised, and off they went!