Monkeys are "best yodellers" in the world reaching octaves 3 times higher than humans, study says

The world's best yodellers aren't found high in the pristine mountaintops of the Alps – instead, scientists say, they can be found in trees, jungles and rainforests across the globe. 

It's because the world's best yodellers are monkeys, a study published this week in the journal Philosophical Transactions of the Royal Society B found.

Once thought to be the exclusive domain of humans, researchers from Anglia Ruskin University in England and the University of Vienna in Austria recorded and studied the calls of various monkeys at La Senda Verde Wildlife Sanctuary in Bolivia. Primates studied included the black and gold howler monkey, tufted capuchin, black-capped squirrel monkey, and Peruvian spider monkey.