The sting ray's color was an olive brown, so dark in tone that he looked like wet black leather. He was roughly diamond-shaped, like a kite, with rounded sides. He had a long, slim tail that carried vicious barbs along the base of its upper side. It was from the barbs, which served as defensive weapons, that the name sting ray, or stingaree, derived. The ray was harmless to men--unless one chanced to step on him as he lay resting on the bottom ooze. At such rare times, his tail would lash up, inflicting a serious and painful wound. A tiny crab, hatched only a week before, swam upward toward the gleaming surface, his churning legs making a slight disturbance. The ray sensed the small vibrations and instantly changed course, speeding through the water like a fantastic spaceship of the future. Intent on the crab, the ray ignored the stronger vibrations caused by a pair of outboard motors and a long, flat-bottomed hull. Not until the crab was within reach did the ray sense imminent danger. With a single flashing movement, he snatched the crab and flung himself upward through the shining surface and into the air. Rick Brant, at the helm of the cruising houseboat, saw the ray break water and he let out a yell. "Scotty! Look!" Don Scott, asleep at full length on the houseboat's sun deck, which was also its cabin top, awoke in time to see the dark shape reenter the calm water. "Stingaree!" he exclaimed. Rick had never seen an area more teeming with life than Chesapeake Bay, unless it was the jungles of the South Pacific. Books, guides to eastern land and water birds, regional fish and reptiles, rested on the cabin top before him, along with a pair of binoculars. He had used them all repeatedly, identifying eagles, wild swans, ospreys, wild duck and geese, terrapin, snapping turtles and water snakes, as well as a horde of lesser creatures. Trailing lines over the houseboat stern had captured striped sea bass, called "rockfish" locally, a species of drumfish called "spot" because of a black spot on the gills, pink croakers that the Marylanders called "hardheads," and the blue crabs for which the bay is famous. He had seen clam dredges bringing up bushels of soft-shelled, long-necked clams that the dredgers called "manos," and he had seen the famous Maryland "bugeyes" and "skip-jacks"--sailing craft used for dredging oysters. The boats were not operated during the oyster breeding season from the end of March until September. Rick's interest in the life of the great bay was to be expected. As son of the director of the world-famous Spindrift Scientific Foundation, located on Spindrift Island off the coast of New Jersey, he had been brought up among scientists. The habit of observation had developed along with his natural--and insatiable--curiosity.