Two years ago, at age 15, he was moved to the Cincinnati Zoo. Zoo officials had hoped Harambe would become a father, helping to help save his species. Western lowland gorillas like Harambe are critically endangered because of habitat destruction and poaching. Although exact numbers are hard to know, it's estimated that fewer than 175,000 Western lowland gorillas are left in the whole world today.
Harambe arrived at the Cincinnati Zoo in September 2014, and was described as "adjusting well" and "very intelligent and curious" on the zoo's website.