In flying thus in lines, I have been struck with the unity which they manifest in their motions: the flight is performed by alternate intervals of heavy flappings, and sailing on outstretched motionless wing; and the resumption or suspension of the one or the other state, is regulated by the leading bird of the line. For example; the first begins to flap; in an instant the second begins, then the third, then the fourth, and so on, with perfect regularity of succession; and neither ceases till the first does, and then only each in his own turn. That this does not depend on the period of each motion being constant, is shown by the fact, that the duration of either state is very varying and arbitrary. If a bird be following the same course, near at hand, but not within the line, he does not regard the succession at all, but governs his own motion. The Pelican on alighting on the water to swim, brings his feet, which before had been stretched out behind, into a standing position, and, as it were, _slides along the surface_, for several yards before he swims. Voracious and formidable as is the Pelican to the smaller of the finny races, he is not without his enemies among them. I once observed a large Shark gliding along at the surface of the water near a flock of swimming Pelicans, wilily endeavouring to approach some unwary one within seizing distance, his triangular dorsal cutting the water and revealing his progress, and his intentions. The Pelicans were alert, however, and did not choose a near acquaintance with their insidious admirer, each one rising into safety upon the wing as he approached. I fear he went without his supper on that occasion.