It was a heart-wrenching incident just waiting to happen.
During a circus performance in Moscow, Russia, late last month, a tiger and a lion shocked the audience when they started attacking one another in the ring.
A video of the performance shows a trainer leading a young lion across the ring past a tiger, who was seated at the sidelines. As the lion passes, the tiger suddenly leaps across and pounces on top of the lion, knocking him over onto the ground and going for his throat.