Cows, camels, sheep, goats, etc being ruminants must chew their
food repeatedly by regurgitating their food from their first
stomach compartment and chewing their 'cud'. This then finer
chewed material makes its way to the various stomach
compartments to be digested. These animals are eating plant
material, the same plant material animals such as elephants,
horses and hippos eat as well. However, these animals only have
one stomach compartment. - Why does one need a multi-compartment
stomach and one does not if they are all eating the same/similar
food?