The acrobatic swirls made by flocks of starlings have long puzzled bird experts. But now scientists at the UK's University of Warwick say they have firgured out how and why they form. Studying video footage, lead researcher Daniel Pearce noticed that areas of light were always visible through the flock. His view - that the changing patterns of light and dark are crucial to flock movement, giving individual birds vital information on their environment.
Download the TV Guide app for iPhone, iPad and Android!