[glowbelly]

humans are the only mammals who choose to drink milk in adulthood.

from peta:

Cows only produce milk to feed their babies. Farmers make sure that cows raised for their milk have a calf each year so that they’ll continue to produce milk. These calves are taken from their mothers when they are just a day or two old so that humans can have the milk. If farmers didn’t take calves from their mothers, the calves would drink the milk, and there would be no need to milk cows.

from moomilk:

Can all cows make milk?

The cow must be a mother before she will produce milk. A newborn Holstein calf weighs about 100 pounds and can walk within one hour after birth!