Green cows were a temporary item that came along with other alien-associated items available for purchase in Farmville. Temporary items change with the seasons. For example, jack-o-lanterns and tombstones were available during Halloween, and turkeys and feast tables were were available for Thanksgiving.
No. Animals don't die on Farmville.
If you'reasking about the green "Alien Cow" aka Bov1ne-09, the answer is Milktonium. It's gone now (limted edition) but maybe they'll bring it back next year.
You can get cows on Farmville when your Farmville friends gift them to you or by adopting them when they wander across a neighbors farm and that neighbor posts a notification about it allowing you to adopt the lost cow.
To harvest cow on farmville you need to click it. Your character will then go over to the cow and harvest it.
A friend/neighbour on FarmVille must send it as a gift! :-) Hope this helps!
It gives you 5 farmville cash each day
Because you can milk it.
You will need 2 milks from a cow to make butter in Farmville 2.
You cant.
You probably just collect milk?
One day.
You get strawberry milk from the pink cows, Milktonium from the green cows, chocolate milk from the brown and regular white milk from the brown and white cows.