Sheep are known for many things, but if you thought farting wasn’t one of them, think again. Sheep are responsible for releasing significant amounts of carbon dioxide and methane into the atmosphere.

Sheep are related to antelopes, cattle, muskoxen and goats. All of these mammals are even-toed ungulates — their hooves are cloven, or split into two toes. They are also ruminants — their stomachs ...