14 The Naturalist in La Plata.
is a stretch of sandy soil, or a range of dunes, there it is found living; not seen, but heard; for all day long and all night sounds its voice, resonant and loud, like a succession of blows from a hammer; as if a company of gnomes were toiling far down underfoot, beating on their anvils, first with strong measured strokes, then with lighter and faster, and with a swing and rhythm as if the little men were beating in time to some rude chant unheard above the surface. How came these isolated colonies of a species so subterranean in habits, and requiring a sandy soil to move in, so far from their proper district--that sterile country from which they are separated by wide, unsuitable areas? They cannot perform long overland journeys like the rat. Perhaps the dunes have travelled, carrying their little cattle with them.
Greatest among the carnivores are the two cat-monarchs of South America, the jaguar and puma. Whatever may be their relative positions elsewhere, on the pampas the puma is mightiest, being much more abundant and better able to thrive than its spotted rival. Versatile in its preying habits, its presence on the pampa is not surprising; but probably only an extreme abundance of large mammalian prey, which has not existed in recent times, could have, tempted an animal of the river and forest-loving habits of the jaguar to colonize this cold, treeless, and comparatively waterless desert. There are two other important cats. The grass-cat, not unlike Felis catus in its robust form and dark colour, but a larger, more powerful animal, inexpressibly savage in disposition. The second, Felis geoffroyi,
The Desert Pampas. 15
is a larger and more beautiful animal, coloured like a leopard; it is called wood-cat, and, as the name would seem to indicate, is an intruder from wooded districts north of the pampas.
There are two canines: one is Azara's beautiful grey fox-like dog, purely a fox in habits, and common everywhere. The other is far more interesting and extremely rare; it is called aguará, its nearest ally being the aguará-guazú, the Canis jubatus or maned wolf of naturalists, found north of the pampean district. The aguará is smaller and has no mane; it is like the dingo in size, but slimmer and with a sharper nose, and lias a much brighter red colour. At night when camping out I have heard its dismal screams, but the screamer was sought in vain; while from the gauchos of the frontier I could only learn that it is a harmless, shy, solitary animal, that ever flies to remoter wilds from its destroyer, man. They offered me a skin--what more could I want? Simple souls! it was no more to me than the skin of a dead dog, with long, bright red hair. Those who love dead animals may have them in any number by digging with a. spade in that vast sepulchre of the pampas, where perished the hosts of antiquity. I love the living that are above the earth; and how small a remnant they are in South America we know, and now yearly becoming more precious as it dwindles away.
The pestiferous skunk is universal; and there are two quaint-looking weasels, intensely black in colour, and grey on the back and flat crown. One, the Galictis barbara, is a large bold animal that
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