To function, tortoises must get heat from their environment. Zoos in temperate zones usually provide them with heat lamps. Infrared images show that heat lamps warm the shell surface, but raise core body temperature less well. This project will use thermal imaging cameras to compare the effectiveness of different external heat sources in warming tortoises. The results will determine the heat sources to be installed in the new tortoise house being built at Newquay Zoo. Endorsed by BIAZA.