PETS is a research project being conducted by the Murdoch Childrens Research Institute at The Royal Children's Hospital, Melbourne. PETS is a study of twins, from when they were in the womb through to childhood and beyond. We aim to work out what makes us all who we are; our health, development and wellbeing. We have chosen to start our research with twins, who share the same mother, but are usually in their own 'sac' during pregnancy, then share the same home environment as children. Despite this, even 'identical' twins can have different personalities, physical characteristics and illnesses. We want to know why these differences exist and what they can tell us about the first years of life. For more information on PETS, who we are what we have found, please see our PETS poster .