The attraction opened on 27 June 1973 as the Singapore Zoological Gardens with 272 animals across 72 species. Nowadays, the Singapore Zoo has over 4,200 animals of over 300 species.
And, at a time when many zoos around the world had exhibits with animals in cages, the Singapore Zoo stood out for its open layout concept.
Animals were and still are, displayed in enclosures that resembled their natural habitats. Instead of cages and bars, the exhibits make use of barriers like moats or glass panes to allow visitors to a clear view to the animals.