Set on 125 undulating acres on the southern fringe of the Sunset District, San Francisco Zoo has been steadily improving over the past decade. In 1997, San Franciscans approved a $48 million bond to rebuild two-thirds of the zoo by 2004, focusing on more naturalistic habitats for its 1,000 denizens. The Lurie Education Center and Koret Animal Resource Center opened in 2001 as a first step. In 2002 the Lipman Family Lemur Forest debuted, harboring five species of this primate from Madagascar, and in 2004 the zoo introduced a spacious new African savanna exhibit, with three acres of territory for giraffes, zebras, kudus and ostriches to roam. Just past the entrance, the Children's Zoo features meerkats and prairie dogs, an insect zoo, terrariums at kids' eye level, and a petting barnyard. (Kids also like riding on Little Puffer, a miniature turn-of-the-20C steam train.) At the superb Primate Discovery Center, 15 species of rare and endangered monkeys and prosimians cavort and swing in open atriums. The adjacent Aye-Aye Forest houses endangered aye-ayes, the first breeding pair of these rare nocturnal primates to be exhibited in public. Visitors to Penguin Island can view the world's most successful breeding colony of Magellanic penguins (feedings Fri-Wed 3pm; Thu 2:30pm).