2 million years

First human populations

30,000 years

Modern humans

14,000 years

Glacial melt → Dogs

11,000 years

Recent Age

11,000 years

Sheep

9,000 years

Swine and crops

7,000 years

Cattle, goats, and horses

5,000 years

Poultry

3,500 years

Cats

Common characteristics of animals that were domesticated:

- Generally lived comfortably in groups - Had some type of dominance hierarchy - Tolerated humans - Adapted to a variety of environments - Reproduced successfully in captivity