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盘点：世界上最聪明的动物们

当研究者将标记放置在海豚身上时，这些海洋里的机灵鬼看了镜子以后发现了自己身上的标记。换句话说，它们清楚标记是在自己身上，而不是在别的动物身上。它们也很清楚镜子里的海豚就是自己。

Crows 乌鸦

It’s hard to imagine that a crow could be as smart as you, or perhaps even smarter. But scientists have done a series of studies that prove that they might be just as good, or better, at solving problems. In one study, researchers gave crows and humans the same puzzle: A toy floats on top of water inside a tall glass, too narrow for a bird to get its beak down or for a small child to place their hands into. Children younger than eight years old are completely stumped, and generally can’t figure out a way to get the toy. But crows aren’t confused at all. They simply drop pebbles into the narrow glass. Eventually the stones displace enough water at the bottom of the glass that the toy rises to the top, and the birds can quickly snatch it.

你一定想象不到乌鸦可能和你一样聪明，或许比你还要聪明。科学家为此做了一系列的研究来证明，在解决难题这一方面，乌鸦可能不比人类差。在其中的一项研究中，研究人员给了乌鸦组和人类组相同的题目。在一个装着水的高玻璃瓶里漂浮着一个小玩具，瓶口很窄，乌鸦的嘴无法伸进去，人类小孩也无法把手伸进去。人类8岁以下的孩子完全懵了，根本不知道怎么拿出玩具。但是乌鸦完全不在话下。它们简单地将小卵石叼进玻璃瓶，最终玻璃瓶底聚集的卵石将水面抬高，小玩具漂浮到瓶口，然后乌鸦一下就把玩具叼了出来。

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