Rare mammoth tusk found on West Texas ranch

A photograph of researchers wrapping a mammoth tusk in plaster on the O2 Ranch in West Texas.

A hunter looking for deer on a West Texas ranch instead discovered a rare mammoth tusk, researchers say.

The tusk was sitting in the drainage area of a creek bed on the O2 Ranch in Brewster and Presidio counties near Big Bend National park, according to a statement released by Sul Ross State University in Texas.