verge of extinction, these long-legged swift canines changed their
habits and lost their bold spirit, degenerating at last into hunters of
small birds and mammals, on which they are said to live.

The rhea possesses a unique habit, which is a puzzle to us, although it
probably once had some significance--namely, that of running, when
hunted, with one wing raised vertically, like a great sail--a veritable
"ship of the wilderness." In every way it is adapted to the conditions
of the pampas in a far greater degree than other pampean birds, only
excepting the rufous and spotted tinamous. Its commanding stature gives
it a wide horizon; and its dim, pale, bluish-grey colour assimilates to
that of the haze, and renders it invisible at even a moderate distance.
Its large form fades out of sight mysteriously, and the hunter strains
his eyes in vain to distinguish it on the blue expanse. Its figure and
carriage have a quaint majestic grace, somewhat unavian in character,
and peculiar to itself. There are few more strangely fascinating sights
in nature than that of the old black-necked cock bird, standing with
raised agitated wings among the tall plumed grasses, and calling
together his scattered hens with hollow boomings and long mysterious
suspira-tions, as if a wind blowing high up in the void sky had found a
voice. Rhea-hunting with the bolas, on a horse possessing both speed and
endurance, and trained to follow the bird in all his quick doublings, is
unquestionably one of the most fascinating forms of sport ever invented,
by man. The quarry has even more than that fair chance of escape,
without which all sport degenerates into mere butchery, unworthy of
rational beings; moreover, in this unique method of hunting the ostrich
the capture depends on a preparedness for all the shifts .and sudden
changes of course practised by the bird when closely followed, which is
like instinct or intuition; and, finally, in a dexterity in casting the
bolas at the right moment, with a certain aim, which no amount of