P9J-333 herbivore
From The Stargate Omnipedia
Docile, harmless animal on P9J-333. Because the creature is described by the locals as "shy," Stargate Command personnel were surprised to discover it was responsible for numerous deaths on its home world. The creature had been infected with an extradimensional parasite, transforming it into a carnivorous beast.
KEY EPISODE
Uninvited - Stargate Command discovers the original genetic material of a predator laying in a lab once belonged to a docile herbivore on P9J-333.