Harambe's Death a Stark Reminder of Zoo Accidents

National Geographic 

Since 1990, animals died during escapes or attacks 42 times in U.S. zoos accredited by the Association of Zoos and Aquariums, according to a database compiled by Born Free USA, a nonprofit animal advocacy group. In that same timeframe, 15 zoo incidents resulted in the loss of human life, and 110 resulted in injury, including the Cincinnati Zoo incident.