Cow's eat grass so it usually comes out green. However, it also depends on what the cow eat's. But cow's can't eat that much, just pretty much hay and grass just like horses have to eat hay and grass.
No.
On the ground.
No. Flies are attracted to the cows dung.
cows cant see color red
No, they do not.
Yes, just like all animals, including humans, do.
because their digestive systems work in different ways.
Green
yess
brown
black
Purple:P