For this week's Living World, Joanna Pinnock heads to a site in Cambridgeshire which is currently part of a long term study into jackdaw behaviour. Here she meets Dr Alex Thornton on a blustery morning before dawn. As first light begins to creep silently over the horizon the first chattering's of a jackdaw roost can be heard. With increasing light, this chatter becomes louder until at some given signal, the jackdaws simultaneously leave their night roost in a cacophony of sound. It is a winter spectacle often overlooked but rivalling any in the natural world. So what is actually going on here?