They don't. Cows only have one digestive system. They do, however, have a stomach with four chambers. Perhaps that is where you are getting the four-something from as far as bovine digestive physiology is concerned.
4
Animals with more than one stomach, such as pigs and cows, are referred to as "polygastric", poly- meaning many and -gastric referring to the stomach.The scientific term is called poly-gastric ("many-stomach), for example cows are ruminants, they have four stomachs (or one stomach with four chambers).
Ruminants are animals that chew their cud and have 4 stomachs. This includes cattle, sheep, goats and antelope.
Still methane.
There are actually many animals that have four stomachs; two of the commonly known ones in the United States are cattle and bison.
Well ruminants are animals with four-chambered stomachs, like cows or goats. WE are a ruminant. We have only one stomach, and we don't need to re-digest food. Like dogs and cats.
T-rex did not have two stomachs. Today, ruminants (grass eating animals such as cattle) have two stomachs in order to better digest the grass they eat, which is very difficult to digest.
complex animal have two stomachs
No. Koalas are not ruminants. Ruminants have stomachs with four chambers; a koala's stomach has just one chamber.
Four. Other ruminants (choose any two) include bison, cape buffalo, deer, sheep, yak, and antelope, among many others.
Bacteria in the stomachs of cows and other ruminants (animals with chambered stomachs) produce methane, a strong greenhouse gas, that the animals release mostly by burping but sometimes also by farting. Ruminant livestock (domestic farm animals), including cows and sheep, do release a significant amount of methane.
They have a unique stomach with four sections as do all ruminants
Animals with multiple stomachs are known as ruminants. Examples of these are cattle, sheep and goats. They do not actually have multiple stomachs, but stomachs which have a number of 'compartments'. The examples given above are characterised by having four distinct sections to their stomachs, although camelids (camels, llamas, alpacas, vicunas) have a slightly different arangement and are sometimes described as having three stomachs.