Jerusalem Biblical Zoo Reproduction Management Institute for Zoo Biology and Wildlife Research of Berlin, zoo veterinarians impregnated one of their female elephants, Tamar, with sperm obtained from Emmett, a bull elephant in the Whipsnade Animal Park, Bedfordshire, England. On 10 December 2005, Gabi's six-hour birth was viewed by over 350,000 people in 108 countries via live streaming on the zoo's website. The zoo has also pioneered the use of animal birth control. It was the first to use a dart gun to implant a slow-release hormone into the thigh of a female giraffe; she is the daughter of the zoo's bull giraffe, and
Milwaukee County Zoo mall, and grizzly bear den. The zoo also opened with a gauge miniature railway, the "Zoo Line", which carried visitors around the zoo to view the exhibits and construction. The Zoo Line (now known as the "Safari Train") has continued to run, operating with real steam locomotives. In 1959, construction started on the dall sheep mountain and the Alaskan bear exhibit. On May 13, 1961, the Milwaukee County Zoo officially opened to the public. Later additions included the aviary (1962), the Australian building (1963), the original animal hospital (1963), the small mammal building (1965), the aquarium (1968), and the reptile