The parrots were given the intellectually demanding task of pulling a snack on a string up to their beaks, using a co-ordinated combination of claws and beak.

鹦鹉们被分派了一项对智力要求很高的任务，它们要协调爪子和喙，将一份拴在绳子上的零食拉到它们的喙上。

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But many people find it a demanding task.

但是许多人发现这是一项艰巨的任务。

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"We were human beings carrying out a very demanding task," he says. "we had to improvise."

“我们只是执行艰巨任务的普通人，”他说，“我们必须随机应变。”

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That task is more complicated than it used to be, and it's not because cooking is an intellectually demanding task.

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"This would have been a most demanding task for security forces anywhere in the world, and we should acknowledge the resolve shown by the Algerians in undertaking it, " Cameron said.

CNN: STORY HIGHLIGHTS

"This would have been a most-demanding task for security forces anywhere in the world, and we should acknowledge the resolve shown by the Algerians in undertaking it, " the British leader said.

CNN: STORY HIGHLIGHTS