A silvery gibbon female at Prague Zoo, has given birth to a healthy baby - the first born in captivity in the Czech Republic. The parents are the female Alangalang and male Flip, both ten years old, who were acquired by the zoo last year. Alangalang arrived in Prague from Howletts, England, and Flip from Munich. Both take excellent care of their young, Prague Zoo said. In the wild, silvery gibbons live on Java and rank as the most endangered of primates.