Quick Take The “big truck, small man” phenomenon is also seen in the animal kingdom. The loudest howler monkeys were found to ...

Baby, I'm howlin' for you. Male howler monkeys make deep and boisterous calls to attract mates, but the deepest-pitched songs may come at cost: the size of their testicles. A new study in the journal ...

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