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Now, a few tens of thousands of years ago, wolves and people started becoming friendly species.
時至今日，數萬年前，狼和人便慢慢演變成進化成為可以友好相處。
You can imagine a person tossing a bone to a friendly wolf from time to time.
你可以想象人們會時不時地向一只溫順的狼扔塊骨頭。
But “friendly” is the key.
但是“溫順”一詞至關重要。
Nobody ever gets close to a hostile wolf.
沒人會靠近一只充滿敵意的狼。
So over many thousands of years we would have been gradually selecting for certain behavioral traits-playfulness, low hostility, the ability to bond.
因此，實際上，成千上萬年以來，人類都在漸漸地、有意識地進行著選擇，選擇具有特定行為特征的狼群。這些特征包括愛嬉戲玩鬧，溫順，合群。
Very puppy-like behaviors! See what's happening?
這些行為難道不像小狗嗎？
A species that resembles a wolf puppy that never grows up may have slowly evolved in this way.
現在明白這是怎么回事了嗎？就像這樣，一種類似于狼崽的物種開始慢慢的進化著。
That species would retain its puppy-like behaviors, such as barking, but never grow into growling, howling adult wolves.
這一物種保留了那些幼崽般的行為特征，比如吠叫，它們也不會進化為嚎叫的成年狼。
That species We would now call that species “dogs.”
這一物種便是我們現在把它稱之為“狗”的動物。
