Do you know who is man's best friend? He turned out to be man's greatest rival.

Since their emergence
over 200,000 years ago,
modern humans have established
homes and communities all over the planet.
But they didn’t do it alone.
Whatever corner of the globe you find
homo sapiens in today,
you’re likely to find another
species nearby:

Canis lupus familiaris.

Whether they’re herding, hunting,
sledding, or slouching

the sheer variety of domestic
dogs is staggering.
But what makes the story of man’s
best friend so surprising

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is that they all evolved from a creature
often seen as one of our oldest rivals:
Canis lupus, or the gray wolf