Which animal is NOT a psuedo-ruminant?

To understand why sheep are considered true ruminants rather than pseudo-ruminants, it's important to know the distinction between the two. True ruminants, such as sheep, are characterized by having a complex stomach structure with four compartments: the rumen, reticulum, omasum, and abomasum. This multi-chambered stomach allows them to efficiently break down fibrous plant material through a process of fermentation.

In contrast, pseudo-ruminants, such as llamas, alpacas, and camels, have a different stomach structure that usually contains three compartments instead of four. While they share some similarities with true ruminants regarding their feeding behavior and adaptation to a herbivorous diet, their digestive processes are somewhat less complex. For example, camels and llamas have adapted to digesting tougher vegetation with their three-chambered stomachs, but they do not possess the same level of compartmentalization seen in true ruminants like sheep.

Therefore, sheep are clearly identified as true ruminants due to their four-compartment stomach, distinguishing them from animals like llamas and alpacas, which are categorized as pseudo-ruminants.