JOHANNESBURG – They give up their lives protecting nature and each year, park rangers who died in the line of duty are remembered.World Ranger Day is commemorated on the 31st of July and this year, Sanparks mourned two rangers who were killed.READ: More security expected at National Parks to preserve natural heritageThis year’s commemoration was held under the theme, ‘30 by 30’.Dr Guy Fyvie, Veterinary Affairs Manager at Hill’s Pet Nutrition had a discussion with eNCA on this.