context: The Red List of Threatened Species is a list that classifies and studies the conservation status of plant and animal species. Established in 1963, it is issued by the World Conservation Union, the official conservation authority in the world [1]. WWF aims to reassess each species category every 5 years if possible, or at least every ten years.
question: In what year was the Red List of Endangered Species established?
answers.text: 1963