The rumen of an adult cow can hold roughly 200 litres and is packed with billions of bacteria that break down the vegetal matter their cow host consumes. (As an aside, many bovine digestion ...
The global herd comprises roughly 1.6 billion cows, each with four stomachs (or, technically, one quadripartite stomach), the largest part of which is the rumen. The rumen of an adult cow can hold ...