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Because they can. It's a form of vocalization that tells other animals (other cattle, humans, etc.) whether they are looking for a lost friend or calf, hungry, ready for battle, in pain, dying, in heat and looking for a mate, etc.
But really, in real life, cows don't make a "moo" noise. It's more of a "mmmrraaww" noise. The description of the noise a cow makes in the English language is the best representation in as few letters as possible that we can make.
What else can I help you with?
Do gorillas moo?
Uh, no...cows do, gorillas beat their chest and roar.
What are moo cows?
"Moo cows" are, essentially, cows that moo.
Do German cows moo?
yes all cows moo.
Can cows moo?
Yes.
Do cows die when they moo?
No.
Why do cows go moo moo to too too?
They have a stuttering problem
What is the number that is between 80 and 200?
moo moo cows that are weird
Can a cows moo scare a duck?
Yes but only if its loud moo
Do cows really Moo?
Yes.
Do cows moo when they mate?
No, not usually.
Why don't frogs moo?
Frogs don't moo because they aren't cows!
Do cows moo because they need to be milked?
With dairy cows, yes. Other times cows (including beef cows) will moo when they are calling to their calves, or when it's feeding time, or even when they're in heat.
