A dog or a cat can teach us a lot about human nature; they are a lot more like us than some might think.

一只狗或一只猫能教给我们许多关于人类的本性的东西。它们比某些人想象的更像人类。

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Over time, as they experience the world, the toddlers refine their abilities and focus on what's really relevant, say, human faces rather than monkey or dog mugs.

随着时间流逝，对世界的感知，这些孩子们开始优化自己的能力，开始集中于真正相关的事情上，比如人脸，而不是猴子或者狗的脸。

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In fact monkey may become cat or dog to experience human contact.

事实上，猴子可能得先变成猫或狗，去体验与仁攀类接触。

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Once they see the animal, they dive and pin it to the ground, letting a human or gun-dog retrieve the carcass.

WSJ: Learn Ancient Sports Around the World

That has led to concerns that the birds used to make the eggs themselves could succumb to bird flu. (The companies emphasize that the chickens are kept under extremely secure conditions.) There is research going on to use dog, monkey or human cell cultures to produce flu shots, but such production is five to ten years away.

FORBES: Flu Shot Gold Rush

Researchers concluded that any such "guilty look" is a response to human behaviour and has no relation with the dog's actions or sense of having broken any rules.

BBC: Can dogs really look 'guilty'?