A phenomenon, which is seen on the banks of the Mississippi and most other rivers which overflow their banks, also occurs here. The land is highest near the water’s edge, and gradually falls inland, caused by the heavier sediment being deposited during floods at the shortest distance, while the lighter matter only is carried inland, and spread over a larger area. The surface of the campos is very uneven for walking, being in little clumps or hillocks, so that it is equally tiresome and fatiguing to walk on their summits or between them. The stems of the palms were all covered with orchideous plants, but they had now generally neither leaves nor flowers, and seemed to be of very little variety of species. In the marshy places shrubby convolvuli are abundant, and in others are large beds of cassias and mimosas, while scattered among them are many delicate little flowers. Long-tailed, light-coloured cuckoos were continually flying about from tree to tree, uttering their peculiar note, not at all like that of our cuckoo, but more like the creaking of a rusty hinge, which the name given to them, _Carerú_, is intended to resemble. Equally abundant are the black hornbill cuckoos, called Anús; and on almost every tree may be seen sitting a hawk or buzzard, the variety of which is very great, as in a few weeks I obtained eight different kinds. Pretty paroquets, with white and orange bands on their wings, and others with an orange-coloured crown, were very plentiful, and it was amusing to watch the activity with which they climbed about over the trees, and how suddenly and simultaneously they flew away when alarmed. Their plumage is so near the colour of the foliage, that it is sometimes impossible to see them, though you may have watched a whole flock enter a tree, and can hear them twittering overhead, when, after gazing until your patience is exhausted, they will suddenly fly off with a scream of triumph. Then among the bushes there were flocks of the beautiful red-breasted oriole, _Icterus militaris_; but they were unfortunately not in good plumage at the time of my visit. The common black vulture is generally to be seen sailing overhead, or seated on some dead tree; and great Muscovy ducks fly past with a rushing sound, like some great aerial machine beating the air violently to support its ponderous body, and offering a striking contrast to the great wood-ibis, which sails along with noiseless wings in flocks of ten or a dozen. In the skirt of forest and in the larger “ilhas,” black and spotted jaguars are often found, while pacas, cotias, tatus or armadillos, deer, and other small game are plentiful.