system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 where were farm animals like cows and pigs and chickens in the wild originally before humans?
gpt
Domestic cattle descend from aurochs, a now extinct species which once ranged all across Asia, Europe, and North Africa.

Domestic pigs descend from the Eurasian wild boar, which had a similar range as the aurochs. 

The ancestor of domestic chickens are red junglefowl, native to Southeast Asia.

You didn't ask, but I'll include them anyway: sheep are descended from the wild mouflon, native to the Caspian region of Eurasia. Goats descend from the common ibex, native to western and central Asia. Turkeys are the only common domestic animal native to the new world; wild turkeys are native to North America.