Moo Who?
Moo Who? is a 2004 children's book written by Margie Palatini and illustrated by Keith Graves. It was published by HarperCollins.
Plot
An anthropomorphic cow, Hilda Mae Heifer, who is known for her distinctive mooing, is hit on the head by a cowpie and loses her voice.
She enlists the help of other farm animals to find it.