Man (Homo sapiens sapiens), Cow (Bos taurus), and Ram (Ovis aries)
The structure of the ruminant animals varies considerably. It’s important for the artist to recognize the vertebral layout and rib structure, even of animals that are covered in thick wool or fur. Wild bovids (such as bison) and aurochs have extended cervical vertebrae that form a “hump” over their shoulders.
A Comparative View of the Human and Animal Frame. B. Waterhouse Hawkins, 1860.