Little Mark developed rapidly. Within a few weeks the baby’s hair grew in thick and black (although a siamang’s long adult hair does not appear until the animal is two or three years old). Mark began to venture away from Suzy for short periods of time, tentatively exploring the environment. Now that the baby was older, Unk began to take a more active role in family life. He sometimes played with Mark, but very gently, seeming to realize that the small animal could not endure rough treatment. He was remarkably tolerant of the baby, allowing Mark to hang on his fur or climb over his face without punishment. Within months, zoo officials were certain that Suzy and Unk were good parents. Mark was obviously healthy and well-nourished, and seemed normal in every way. However, as the baby began to move about the enclosure, the zookeepers made an interesting discovery: Mark was most definitely a girl. Should she be re-named? The public knew the baby as Mark. On the other hand, Mark was a strange name for a female animal. In the end, it was decided to let the name remain. After all, the baby was the very first siamang born and raised by its mother in captivity. She had truly made her mark on the zoo world. The zoo world agreed. Every year, the American Association of Zoological Parks and Aquariums gave an award to a zoo that bred a rare animal. In 1962, two AAZPA awards were given. One went to the Portland, Oregon Zoo for the birth of an Indian elephant. The other award went to the Milwaukee Zoo for the birth of a siamang gibbon named Mark.