A sheep or domestic sheep is a domesticated, ruminant mammal typically kept as livestock. Although the term sheep can apply to other species in the genus Ovis, in everyday usage it almost always refers to domesticated sheep. Like all ruminants, sheep are members of the order Artiodactyla, the even-toed ungulates. 

Bronze Serpent On Pole

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And the LORD said unto Moses, Make thee a fiery serpent, and set it upon a pole: and it shall come to pass, that every one that is bitten, when he looketh upon it, shall live. 

Caduceus is a symbol with a short staff entwined by two serpents, sometimes surmounted by wings while the Rod of Asclepius is the one with a single snake. [3] The similarity between both these symbols is the snake.

The caduceus, a staff with two snakes coiled around it, is the official insignia of the United States Medical Corps, Navy Pharmacy Division, and the Public Health Service. The caduceus is also the magic wand carried by Hermes (the Romans knew him as Mercury), the messenger of the gods.  

Columbidae is a bird family consisting of doves and pigeons. It is the only family in the order Columbiformes. These are stout-bodied birds with short necks and short slender bills that in some species feature fleshy ceres. They primarily feed on seeds, fruits, and plants