"The sound came like faint thunder or distant artillery, and the first time was felt more than heard. It came again, and I tried to fix the location. It was a long ways off, perhaps toward our bait, and it was unmistakable. I listened as long as I could but finally gave in to the jet lag and fell into a sound and dreamless sleep, untroubled by phantom sable or charging leopards...

That evening as I drifted off to sleep, the lions roared."

From Mount Kenya to the Cape by Craig Boddington
describing his first evening in camp along the Kafue Plateau in Zambia.