This is what the keeper said: "The orangutan youngster Sprout managed to damage the window glass by scratching it with a stone". So they put up some electric wire. Now you would think, that would stop the youngster, but it didn't. They kept finding the wire had been pulled off the window. This video shows the technique the orangutan uses to circumvent the wire. She wraps the piece of paper around the wire carefully and holds it together ready for pulling, but has a last glance at me. You can see in her eyes that she knows she's not supposed to do it.
As she only had paper instead of cardboard available today, she wouldn't have managed it, but it definitely shows the clever thinking and working out the technique.
Update: The electric wire has been removed a few months after this video) and Sprout is all grown up. She just had a baby and is still with mum Jazz.
Watch more videos of her and the family
https://youtube.com/playlist?list=PLXC1aShJSBiWzrrsdhzFpsAwwPos2l6dg
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