Who's the king of the jungle? An old question about inter-species conflict has, unfortunately, been answered. A tiger killed a lion at a zoo in Turkey after finding a gap in the fence that separated them, the BBC reports. Zoo officials say the tiger killed the lion by severing its jugular vein with a single swipe of his paw. The zoo has six tigers and two remaining lions, and insists it is still safe to visit. (More Bengal tigers stories.)