WILDLIFE -- When the Sky Goes Dark: The Megabats of Africa

For two months a year, one of the most spectacular sights known to man can be witnessed in southern Africa. Ten million megabats from all regions of central Africa gather for the world's largest congregation of their species, descending on a small forest in Zambia. In the morning and at night, these bats blanket the vast expanse of sky. The size and scope of this migration means there is an obvious impact on the forest ecosystem. Plus, giant eagles and hawks gather to hunt the megabats and fierce battles ensue. Why do these bats choose to congregate in this particular forest? The secrets of a recently discovered spectacle of nature have now been revealed.