"A bezoar is a stone taken for the stomach of a goat and it will save you from most poisons." - Professor Snape, Harry Potter and the Philosopher's Stone.
"He hurtled back to Ron's side, wrenched open his jawn, and thrust the bezoar into his mouth. Ron gave a great shudder, a rattling gasp, and his body became limp and still." - Harry Potter and the Half-Blood Prince
A Bezoar Goat:
Took my little sister to the natural history museum today and imagine my surprise at finding a Bezoar goat in a display case!