A limitation of current seabird tracking is short temporal deployment durations because the device is attached to feathers with tape or glue. The tag or its attachment feathers generally drop within a number of days. This ground breaking development project was to design a seabird tracking device which would provide longer movement and survival data and be fully integrated into a 3D printed legring. The tag was initially designed for the Guillemot (Uria Aalge) for deployment at the Marine Demonstration Zone (MDZ) adjacent to RSPB South Stack on Anglesey.