One of the zoo's most famous giant pandas, Chi Chi, arrived in 1958. Although originally destined for an American zoo, Washington, D.C. had ceased all trade with communist China and so Chi Chi was refused entry to the United States. In the interests of conservation, ZSL had stated they would not encourage the collection of wild pandas. However, when it was pointed out that Chi Chi had already been collected, her purchase was approved, and she immediately become the star attraction at London Zoo. As the only giant panda in the west she was the inspiration of Peter Scott's design for the World Wildlife Fund logo. In July 1972, Chi Chi died and was publicly mourned.