Endangered Animals

Siamang Gibbon

Symphalangus syndactylus Siamang Gibbon

Animal Class:


Status in the Wild:

No Monkey Business

Siamang Gibbons are apes, not monkeys. One way to distinguish apes from monkeys is that apes do not have tails.

Family Harmony

Siamang Gibbon couple “Bull” and “Salem” announce their territory and reaffirm their commitment to each other with daily duets.  Siamang Gibbons are known for their calls, and paired males and females create their own unique “song.” It consists of a series of booms and barks, and is amplified by their inflatable throat sacs.  Even the couple’s kids get involved; each one adds their own sound to the call.  

Oh, Baby!

Siamang Gibbons are endangered animals, but important work is going on right here, in Sioux Falls, to save this species. The Great Plains Zoo is home to highly-rated breeding pair “Bull” and “Salem”. The couple has welcomed three boys into their family since 2008. Not only were these exciting births for our Zoo, they were important to the survival of the entire Siamang Gibbon population. This species’ numbers have declined by at least 50 percent over the past 40 years due primarily to hunting for the pet trade and continued habitat loss.  


  • Amur Tiger
  • Eastern Black Rhinoceros
  • Eastern Bongo
  • Giant Anteater
  • Grevy's Zebra
  • Humboldt Penguin
  • Red Panda
  • Red Wolf
  • Siamang Gibbon
  • Snow Leopard
  • Swift Fox