The monkeys' "ultra-yodels" had frequency leaps that were five times larger than human frequency changes, often exceeding ...

Humans' closest living relatives ... Unlike many New World monkeys, Old World monkeys cannot use their tails for gripping. Ape species are divided into the lesser apes, or gibbons, and the great ...

It turns out apes and monkeys possess vocal membranes in their throats that humans lack. Scientists suspect these structures ... to introduce what the scientists call “voice breaks” into their calls.

Yodelers of the world, you never stood a chance: Monkeys will always be better at yodeling than humans because they have a "cheap trick" hidden in their voice box, scientists revealed Thursday.

These membranes allow the monkeys to switch rapidly between very high and very low tones, giving them an impressive vocal range. While humans can typically yodel within a range of about one octave ...