International Primate Protection League - The siamang is the largest gibbon species. Siamang calls are super-loud due to their inflatable throat sacs. (c) RudiErnst | Facebook
air sac Archives - Chimpanzee Sanctuary Northwest
Acoustic analysis of primate air sacs and their effect on vocalization: The Journal of the Acoustical Society of America: Vol 126, No 6
A "singing swinging" lesser ape: the Siamang
Primate Animals | Sioux Falls, SD | Great Plains Zoo
MR images of the laryngeal air sac for the same female chimpanzee... | Download Scientific Diagram
PPT - Acoustic and perceptual effects of air sacs PowerPoint Presentation - ID:619253
Los Angeles Zoo - Siamangs are often mistaken for monkeys, but they actually considered smaller-bodied apes. Siamangs are famous for their loud, lilting calls that can be heard more than two miles
Siamang - Wikipedia
What is a gibbon? — Gibbon SSP
File:PrimateAirSacs Schematic.png - Wikimedia Commons
Happy International Primate Day! - Sacramento Zoo
MR images of the laryngeal air sac for the same female chimpanzee... | Download Scientific Diagram
Pouches, pockets and sacs in the heads, necks and chests of mammals, part I: primates | ScienceBlogs
Siamang | Smithsonian's National Zoo
Happy International Primate Day! - Sacramento Zoo
