The last time Emily Bland met Rishi the orang-utan, they were both still at the crawling stage.

美国小女孩艾米莉和小猩猩“里什”初识时，还都处在刚会爬的婴儿阶段。

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"One day we saw an adolescent orang-utan called Sif wade into deep water, hunker down and then lunge forward making simple paddling movements with her arms and legs," says Russon.

有一天，我们看到青春期红毛猩猩Sif趟进深水，蹲下来，然后用胳膊和腿做出简单的划水动作往前冲。

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Manoj's winning picture, taken in Indonesia, shows a young orang-utan in its mother's arms.

BBC: Winning wildlife pictures go on show

It was taken in Gunung Leuser national park, Sumatra, where wild orang-utan populations have fallen by 50% in the past decade.

BBC: Winning wildlife pictures go on show