are always a possibility—indeed, there have been several well-known cases of male chimpanzee aggression in recent years. Gracie was allowed to keep her baby overnight to grieve, and counseling was being offered to staff (none had witnessed the event), and to the visitors who had seen the event. It is reexamining its policy of how it introduces baby chimpanzees to the tribe. Escapes The Los Angeles Zoo has had a number of notable escaped animals over the years. A particular spate of escapes took place during the late 1990s and early 2000s when, in half a decade, at least 35 animals escaped the zoo including zebras, chimps, kangaroos and antelopes. Evelyn, the gorilla, escaped her enclosure approximately five times. In one widely covered incident, she used some overgrown vines to pull herself out of her exhibit. She then had full run of the zoo for an hour as TV-news copters hovered overhead and visitors were evacuated before she was tranquilized. In a prior incident, she hopped on the back of another gorilla, Jim, to make her escape (Jim had also previously escaped). Part of the problem was that the gorilla habitat was originally intended to house bears; this was alleviated by the opening of a specially designed Campo Gorilla Reserve in 2007. In 1979, Virginia, a wolf, escaped the zoo multiple times by ascending trees, climbing fences, and walking along branches until she could escape. At one time she eluded capture for a month by hiding in Griffith Park. It is unclear whether Virginia was ever recaptured. In 2014, a bighorn sheep escaped from its enclosure, and ultimately the zoo itself. It was struck by a car approximately three hours later and subsequently died. In 2016, Killarney the koala was killed by P-22, the cougar that lived in Griffith Park. Exhibits and attractions Botanical Gardens In 2002, the zoo became a certified botanical garden and the official name of the institution was changed to the Los Angeles Zoo and Botanical Gardens. Spread throughout zoo grounds, there are 15 different collections, highlighting over 800 different plant species, with a total of over 7,400 individual plants. Chimpanzees of Mahale Mountains Chimpanzees of Mahale Mountains, a one-acre (0.4-ha) exhibit complex, opened in 1998 and houses chimpanzees. The hillside exhibit is dotted with boulders, palm trees, and an artificial termite mound, and features a waterfall next to a tall rock ledge where the troop's