In fact, all of our domestic dogs probably came from wolves many years ago.

事实上，所有我们的家狗是多年以前从狼演变而来的。

Whether they're herding, hunting, sledding, or slouching the sheer variety of domestic dogs is staggering.

无论他们是在放牧、打猎、拉雪橇，还是懒散地遛狗，各种各样的家养狗都令人震惊。

And they're even better at this than our oldest animal companion: the domestic dog.

它们在这方面的表现甚至比我们最古老的动物伙伴——家养犬——更好。

All domestic dogs belong to a single species that descended from wolves-despite vast differences in size, appearance, behavior and temperament among breeds.

所有的家犬都属于同一个物种，都是狼的后裔，尽管不同品种之间在体型、外表、行为和性情上存在巨大差异。

Today’s domestic dogs all trace their DNA back to ancient wolves.

今天的家犬都将它们的 DNA 追溯到古代狼。

Wolves and domestic dogs are members of the same species.

【member】狼和家犬属于同一物种。

An african wild dog, jackal or coyote in a domestic dog.

非洲野狗 豺 山狗身上的线粒体DNA。

But figuring out why, where, and when domestic dogs first originated is still a bone of contention.

但是， 弄清楚家犬最初起源的原因、 地点和时间仍然是一个争论的焦点。

And beyond that, it means being exposed  to lots of predators such as wolves, wolverines, eagles, owls, and even domestic dogs.

除此之外，这意味着要暴露在许多捕食者面前，例如狼、狼獾、鹰、猫头鹰，甚至家犬。

Not only can your dog sense when you have a cold, but domestic dogs have shown an aptitude for detecting both much smaller mood fluctuations and far more serious physical conditions.

你的狗察不仅可以察觉到你感冒了，家养狗还表现出了检测微小的情绪波动以及更严重的身体状况的能力。

Those markers in domestic dogs show them to be much more closely related to grey wolves than they are to any other species.

从这些家狗的线粒体 DNA 中可以发现和其他物种对比，他们与灰狼的基因更加相似。

There's no admixture, so we never see a mitochondrial signature of saying an African wild dog, jackal or coyote in a domestic dog.

这里没有任何的基因的糅合， 我们从未在家狗身上发现任何存在于非洲野狗，豺，山狗身上的线粒体 DNA。admixture 英/əd'mɪkstʃə/ 美/əd'mɪkstʃɚ/ n。混合，掺和。

Of the thousands upon thousands of mitochondrial DNA that has been extracted from domestic dogs, every single one of them just looks just like a grey wolf.

在成千上万的线粒体 DNA 中那些从驯养狗身上萃取下来的 DNA每一部分都与灰狼的 DNA 非常接近。

Thankfully Phillip Island, here in Victoria, has been turned into a massive Penguin sanctuary, and the population of foxes and feral cats on the island have largely been eradicated, along with domestic dogs being banned from the island.

值得庆幸的是，维多利亚州的菲利普岛已经变成了一个巨大的企鹅保护区，岛上的狐狸和野猫已基本被消灭，家犬也被禁止进入岛上。