Quotation from: Out of Time's Abyss

Written by: Edgar Rice Burroughs

Sullenly the Wieroos acquiesced. Bradley examined the knots that
held the rope to their ankles, and feeling them secure directed
the girl to mount the back of the leading Wieroo, himself upon
the other. Then he gave the signal for the two to rise together.
With loud flapping of the powerful wings the creatures took to
the air, circling once before they topped the trees upon the hill
and then taking a course due west out over the waters of the sea.