Gladys Porter Zoo is a zoological and botanical park located in Brownsville, Texas. The zoo officially opened on September 3, 1971, and currently averages over 424,000 visitors annually. Situated on 31 acres (13 ha), the zoo houses about 400 animal species (including 47 endangered species) and over 250 tropical and neo-tropical species and subspecies. It is the first zoo to have successfully bred the endangered Jentink's duiker (although none are currently in captivity in the USA). It is also the birthplace of Harambe the gorilla.