Yes actually:

Jane Goodall was known for her research on chimpanzees.[31] The outbreak of the war shocked her,[4] as she had previously considered chimpanzees to be, although similar to human beings, “rather ’nicer’”.[26] Coupled with her 1975 observation of cannibalistic infanticide by a high-ranking female in the community, the Gombe war revealed the “dark side” of chimpanzee behaviour.[26] In her 1990 memoir Through a Window: My Thirty Years with the Chimpanzees of Gombe, she wrote:

For several years I struggled to come to terms with this new knowledge. Often when I woke in the night, horrific pictures sprang unbidden to my mind—Satan [one of the apes], cupping his hand below Sniff’s chin to drink the blood that welled from a great wound on his face; old Rodolf, usually so benign, standing upright to hurl a four-pound [1.8 kg] rock at Godi’s prostrate body; Jomeo tearing a strip of skin from Dé’s thigh; Figan, charging and hitting, again and again, the stricken, quivering body of Goliath, one of his childhood heroes.[23]