Gombe Chimpanzee War
The Gombe Chimpanzee War, or Four-Year War, was a violent conflict between two chimpanzee communities in Tanzania's Gombe Stream National Park from 1974 to 1978. Initially part of the same group, the Kasakela community split, with a faction forming the Kahama group. This division was observed by researcher Jane Goodall in 1974, marking the beginning of the conflict.
#6 Actually a really cool list
#19 I remember when I first found out that the Roman statues used to be paint to make them appear lifelike. Creepy.