Score one for the birds. The pigeons had learned an abstract rule: peck images on a screen in order, lower Numbers to higher.

给鸟类记上一分吧。鸽子已学会了一条抽象规则：按照数量从少到多的顺序轻啄屏幕上的图像。

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Given groups of six and nine, they could pick, or peck, the images in the right order.

给它们几组包含六个和九个物品的图像，它们也能按正确顺序挑选或轻啄图像，证明了鸟类的确很聪明。

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When she found something delicious to eat, she often lowered her head to peck again and again, chuckling in order to ask her children to come and enjoy it together.

胖母鸡找到美味佳肴时，低下头去，一次又一次地啄食，咯咯叫个不停，以便招呼孩子们来一起享受。

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