At my wife's work, some school kid wanted to quiz her on some kind of school project. They asked how many stomachs does a water buffalo have. The choices were between one to four stomachs. My wife guessed one. She told me afterwards and I guessed four which I was right. Water buffaloes are practically cows on a evolutionary scale so four (same as cows) was the most likely answer. Their extra stomachs help them digest food that would be normally inedible to other creatures.