Most visitors to the seaside are content to ride donkeys, eat ice cream, and build sandcastles. But, University of Leeds scientists have no time for sunbathing: they are witnessing the birth of a new species on the rocky shores of North Yorkshire. Littorina saxatilis (right) is an unremarkable rough periwinkle – a small, grey-brown sea-snail which litters the coast by the million. But it has overcome its lack of charisma and grabbed the attention of