As I watched them I suddenly stiffened in sympathy, as I saw all vegetable sloth drop away and each bird become a detached individual, plucked by an electric emotion from the appearance of a thing of sap and fiber to a vital being of tingling nerves. I followed their united glance, and overhead there vibrated, lightly as a thistledown, the first incoming adult heron, swinging in from a day's fishing along the coast. It went on and vanished among the fronds of a distant island; but the calm had been broken, and through all the stems there ran a restless sense of anticipation, a zeitgeist of prophetic import. One felt that memory of past things was dimming, and content with present comfort was no longer dominant. It was the future to which both the baby herons and I were looking, and for them realization came quickly. The sun had sunk still lower, and great clouds had begun to spread their robes and choose their tints for the coming pageant.
And now the vanguard of the homing host appeared,--black dots against blue and white and salmon,--thin, gaunt forms with slow-moving wings which cut the air through half the sky. The little herons and I watched them come--first a single white egret, which spiralled down, just as I had many times seen the first returning Spad eddy downward to a cluster of great hump-backed hangars; then a trio of tricolored herons, and six little blues, and after that I lost count. It seemed as if these tiny islands were magnets drawing all the herons in the world.
Parrakeets whirl roostwards with machine-like synchronism of flight; geese wheel down in more or less regular formation; but these herons concentrated along straight lines, each describing its individual radius from the spot where it caught its last fish or shrimp to its nest or the particular branch on which it will spend the night. With a hemicircle of sufficient size, one might plot all of the hundreds upon hundreds of these radii, and each would represent a distinct line, if only a heron's width apart.
At the height of the evening's flight there were sometimes fifty herons in sight at once, beating steadily onward until almost overhead, when they put on brakes and dropped. Some, as the little egrets, were rather awkward; while the tricolors were the most skilful, sometimes nose-diving, with a sudden flattening out just in time to reach out and grasp a branch. Once or twice, when a fitful breeze blew at sunset, I had a magnificent exhibition of aeronautics. The birds came upwind slowly, beating their way obliquely but steadily, long legs stretched out far behind the tail and swinging pendulum-like whenever a shift of ballast was needed. They apparently did not realize the unevenness of the wind, for when they backed air, ready to descend, a sudden gust would often undercut them and over they would go, legs, wings, and neck sprawling in mid-air. After one or two somersaults or a short, swift dive, they would right themselves, feathers on end, and frantically grasp at the first leaf or twig within reach. Panting, they looked helplessly around, reorientation coming gradually.