スミソニアン国立動物園のインスタグラム(smithsonianzoo) - 11月13日 04時58分

Look up! Our orangutans travel 500 feet between the Great Ape House and the Think tank on the Orangutan Transport System, or O-Line. This #ZooEnrichment encourages the apes to exercise and use their natural climbing and brachiating behaviors. We were the first Zoo to implement an O-Line; it opened in 1995: 20 years ago! #OrangutanCaringWeek

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