"Although these birds approach, at times, very familiarly when they are not chased, they are incapable of being tamed; as soon as caught, they drop tears, without crying, and refuse obstinately all kind of nourishment, until at last they die. There is always found in their gizzard (as well as in that of the males) a brown stone, the size of a hen's egg; it is slightly tuberculated (raboteuse), flat on one side, and rounded on the other, very heavy and very hard. We imagined that this stone was born with them, because, however young they might be, they always had it, and never more than one; and besides this circumstance, the canal which passes from the crop to the gizzard, is by one-half too small to give passage to such a mass. We used them, in preference to any other stone, to sharpen our knives. "When these birds set about building their nests, they choose a clear spot, and raise it a foot and a half off the ground, upon a heap of leaves of the palm tree, which they collect together for the purpose. They only lay one egg, which is very much larger than that of a goose. The male and female sit by turns, and it does not hatch until after a period of seven weeks. During the whole period of incubation, or that they are rearing their young one, which is not capable of providing for itself until after several months, they will not suffer any bird of their own kind to approach within 200 paces of their nest; and what is very singular is, that the male never chases away the females; only, when he perceives one, he makes, in whirling, his ordinary noise, to call his companion, which immediately comes and gives chase to the stranger, and which she does not quit until driven without their limits. The female does the same and allows the males to be driven off by her mate. This is a circumstance that we so often witnessed, that I speak of it with certainty. These combats last sometimes for a long time, because the stranger only turns off, without going in a straight line from the nest; nevertheless, the others never quit until they have chased them away."[17] [17] Voyage de François Leguat, Gentilhomme, Bressan, 1708.