[clearcarbon]

"The ancient artwork is incomplete, but appears to depict a large mammal — probably a type of wild cow — with an oval-shaped body, thin legs and a spear sticking out of its rump."

Early instruction diagram?

[piasa]

"The ancient artwork is incomplete, but appears to depict a large mammal — probably a type of wild cow — with an oval-shaped body, thin legs and a spear sticking out of its rump."

Early instruction diagram?

Yes, as in "What not to do."

Or maybe it's a cartoon. The note on the arrow probably read "Bachelors: how and where to find a piece of @ss."