Suddenly Aragorn leapt to his feet. "How the wind howls!"
he cried. "It is howling with wolf-voices. The Wargs have
come west of the Mountains!"
"Need we wait until morning then?" said Gandalf. "It is as I
said. The hunt is up! Even if we live to see the dawn, who
now will wish to journey south by night with the wild wolves
on his trail?"
"How far is Moria?" asked Boromir.
"There was a door south-west of Caradhras, some fifteen miles
as the crow flies, and maybe twenty as the wolf runs,"
answered Gandalf grimly.
"Then let us start as soon as it is light tomorrow, if we can,"
said Boromir. "The wolf that one hears is worse than the orc
that one fears."
"True!" said Aragorn, loosening his sword in its sheath. "But
where the warg howls, there also the orc prowls."
[ The Fellowship of the Ring, by J.R.R. Tolkien ]