'Hello, is that reception? The couple in the room next door are so noisy it sounds like they've got a couple of elephants in there...' 'Well, sir, you won't believe this...' It's not every day you see a wild elephant standing next to you at the reception of a hotel. But in the Mfuwe Lodge in the 9,500 sq km South Luangwa National Park in Zambia, the sight of elephants strolling around the lobby is a regular occurrence.