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are,
but
it
is
a
fact
that
over
the
last
fiftythousand
years
or
so
wherever
we
have
gone
animals
have
tended
to
vanish,
in
oftenastonishingly
large
numbers.
in
america,
thirty
genera
of
large
animals—some
very
large
indeed—disappearedpractically
at
a
stroke
after
the
arrival
of
modern
humans
on
the
continent
between