but had finally swung into their journey-gait—and when a plover settles down to straight flying, it would seem to be safe from anything slower than a bullet.
Far above the flock floated what seemed a fleck of white cloud blown up from the lower levels. As it drifted swiftly down toward the speeding plover, it grew into a great bird sparsely mottled with pearl-gray, whose pointed wings had a spread of nearly five feet. Driven down from Greenland by cold and famine, a white gyrfalcon was haunting these solitudes like some grim ghost of the upper sky. His fierce eyes were of a glittering black, as was the tip of his blue hooked beak.
As the plover whizzed southward on their way to Summer, some shadow of the coming of the falcon must have fallen upon them; for suddenly the whole flock broke and scattered through the sky, like a dropped handful of beads, each bird twisting and doubling through the air, yet still shooting ever southward at a speed which few other flyers could have equaled. Unluckily for the plover, the gyrfalcon is perhaps the fastest bird that flies, and moreover it has all of that mysterious gift of the falcon family of following automatically every double and twist and turn of any bird which it elects to pursue. This one chose his victim, and in a flash was following it through the sky. Here and there, back and forth, up and down, in dizzy circles and bewildering curves, the great hawk sped after the largest of the plover. As if driven in some invisible tandem, the white form of the falcon kept an exact distance from the plover,
