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. At each arrival, a hoarse chorus went up from hungry throats, and every youngster within reach scrambled wildly forward, hopeful of a fish course. They received but scant courtesy and usually a vicious peck tumbled them off the branch. I saw a young bird fall to the water, and this mishap was from no attack, but due to his tripping over his own feet, the claws of one foot gripping those of the other in an insane clasp, which overbalanced him. He fell through a thin screen of vines and splashed half onto a small Regia leaf. With neck and wings he struggled to pull himself up, and had almost succeeded when heron and leaf sank slowly, and only the bare stem swung up again. A few bubbles led off in a silvery path toward deeper water, showing where a crocodile swam slowly off with his prey. For a time the birds remained still, and then crept within the tangles, to their mates or nests, or quieted the clamor of the young with warm-storage fish. How each one knew its own offspring was beyond my ken, but on three separate evenings scattered through one week, I observed an individual, marked by a wing-gap of two lost feathers, come, within a quarter-hour of six o'clock, and feed a great awkward youngster which had lost a single feather from each wing. So there was no hit-or-miss method--no luck in the strongest birds taking toll from more than two of the returning parents.