Tail biting in pigs is a serious and unpredictable animal welfare problem for farmers worldwide. It results in losses for farmers of £10.4M a year in the UK alone, mainly from carcass condemnation. Before damaging tail biting begins, pigs hold their tails down. This project will develop a system to detect these tail posture changes using a 3D video system giving farmers advance warning of tail biting in time to intervene. We will 1) Collect continuous 3D video from pigs at a high risk of tail biting to capture the changes in tail posture pre-tail biting, 2) Provide a detailed behaviour analysis of tail posture changes and 3) Develop software algorithms to automate this. The project partners provide expertise in pig behaviour (SRUC), a route to market and algorithms for automated 3D video analysis (Innovent Technology Ltd), pork supply chain knowledge (Sainsbury's) video expertise and access to a network of expertise in engineering and precision agriculture (Agri-EPI centre).