Among the principal of his subordinate objects was to keep the fleet together, to obtain good drinking-water and fresh provisions as often as possible. They found the climate delicious, and saw a number of large deer. Considerably higher up the river they anchored near some rocks, where they killed a large number of seals, or sea-wolves, as the Spaniards called them. They found their flesh wholesome and pleasant, and salted a number for their further use. Having spent a fortnight in the River Plate, they again put to sea, when shortly afterwards the fly-boat _Swan_ was lost sight of. In order to save the inconvenience of so many vessels to look after, Drake determined to lessen their number, that the crews of those remaining might be strengthened and have less duty to perform. Winter was coming on, and, in order to prepare for it, a convenient harbour was searched for. While examining the coast, on May 8th, during another storm, the caunter was again separated from the fleet. The ships being much tossed about, they stood in with the intention of coming to an anchor near a headland, off which many rocks were observed. Drake, who never trusted to other men when he could perform the work himself, despising danger and toil, had a boat lowered, and rowed in himself to examine the bay. Approaching the shore, a native was seen singing and dancing, and shaking a rattle, expecting him to land. Suddenly the wind still further increased, while a thick fog coming on, the Admiral lost sight of his ships. He immediately pulled off to try and regain them, but would very probably have been lost in the heavy sea running, had not Captain Thomas of the _Marigold_, at great risk, stood in, and having taken him on board, bravely rode out the gale. Next morning the weather cleared, but the rest of the ships were nowhere visible; the Admiral, therefore, landing, lighted up large signal-fires in the hopes of their being seen by the ships. The natives had fled up the country for fear of the strangers. The seamen found, however, in their huts near the shore the flesh of upwards of fifty ostriches cured, as well of that of other birds, the size of the former being equal to legs of mutton. They discovered also the device by which the ostriches were captured. This consisted of the head, neck, and plumage of the bird fixed to the end of a pole, with large feathers sticking out behind sufficient to conceal a man's body. With these the ostriches were stalked and driven either into some neck of land, or against large and strong nets, with the assistance of dogs.