The smallest of the great apes, gibbons live in the jungles of SE Asia. Many of the 13 species of gibbons are endangered, but they all share a common trait - they are the only apes that sing! They have a beautiful unearthly call that can be heard for several miles in the forest. Every purchase of this Gibbon ringtone makes a donation to the IPPL that operates a sanctuary for gibbons who have been retired from lab research or abandoned by their owners.