Lured by the majesty of Victoria Falls and some of Africa's best national parks, visitors to Zambia will find prolific wildlife in the company of some excellent guides.  Off the beaten track, waterfalls plunge down the country's network of great rivers, wildebeest gather in their thousands on Liuwa Plain, and fruit bats flock to the Bangweulu wetlands.    This fourth edition of Chris McIntyre's Zambia presents all the practicalities in the context of the country's environment, history and culture. It's an unbeatable combination for a great trip.   - National parks in detail, including Luangwa, Kafue and the Lower Zambezi - Wildlife: when, where and what to see - Victoria Falls: 'the smoke that thunders'.